Abstract The first gynandromorph of the insect order Zoraptera is reported. A gynandromorph of Zorotypus brasiliensis Silvestri is described from a likely parthenogenetic population in the Atlantic Forest around the border of the Brazilian states of Minas Gerais, Rio de Janeiro, and São Paulo. As has been previously surmised for this species, the sample consisted of only females, tending to support the hypothesis of thelytokous parthenogenesis for this population. The gynandromorph is largely female in outward appearance, but exhibits male secondary sexual traits on the left side of the apical abdominal segments. The left (male) antenna consists of antennomeres of different proportions to those of the right (female) antenna. The internal genitalia and associated sclerites, however, are female although some are augmented in their form relative to normal-type females. Comments are made on possible factors resulting in the development of the gynandromorph. This is the 16th insect order with gynandromorphism reported.

Se describe e ilustra una especie nueva del género de abejas de cabeza larga Chlerogas Vachal (Halictinae: Augochlorini) a partir de un macho capturado a grandes alturas en el centro de Colombia. Chlerogas tatamaensis Engel & Gonzalez, especie nueva, se distingue de otras especies del género por la coloración y puntuación del integumento como también por caracteres de los órganos genitales del macho. También se presenta una clave actualizada para las especies de Chlerogas.

A new species of the long-headed bee genus Chlerogas Vachal (Halictinae: Augochlorini) is described and figured from a male captured at high elevation in central Colombia. Chlerogas tatamaensis Engel & Gonzalez, new species, is distinguished from its congeners on the basis of integumental coloration and sculpturing as well as features of the male terminalia. A revised key to the species of Chlerogas is provided.

Se presenta información adicional a la monografía del raro género de abejas Chlerogas Vachal (Halictinae: Augochlorini). Se describen por primera vez los machos de C. boliviensis Brook & Engel y C. cyaneus Brooks & Engel, incluyendo la primera descripción de la estructura endofálica reversible para el género. Además, C. cyaneus, una especie anteriormente conocida del norte de Ecuador, es registrada por primera vez para el norte-centro de Colombia.

Supplemental information to the earlier monograph of the rare bee genus Chlerogas Vachal (Halictinae: Augochlorini) is provided. The recently identified males of C. boliviensis Brooks & Engel and C. cyaneus Brooks & Engel are described and figured, including the first account of the eversible endophallic structure for the genus. In addition, C. cyaneus, previously known only from northern Ecuador, is newly recorded from north-central Colombia.

Four remarkable bee species are described and illustrated from southern México and northern Guatemala, all of the genus Lasioglossum and in the diverse subgenus Dialictus, previously documented by 29 species throughout México (although many more occur in the country). Uncommon for most Dialictus, the species treated herein are brilliant metallic blue (hence the reason the first species was originally described in the genus Augochlora) and coarsely and densely punctured, resembling to some extent parasitic bees or chrysidid wasps. Lasioglossum (Dialictus) cyanorugosum sp. nov., L. (D.) oaxacacola sp. nov., L. (D.) verapaz sp. nov., and L. (D.) aurora (Smith) comb. nov., are described, illustrated, and compared with other Dialictus species. A key to the "aurora group" of species is provided.

Se describen e ilustran cuatro especies de abejas provenientes del sur de México y norte de Guatemala, todas incluidas en el género Lasioglossum, subgénero Dialictus, este último significativamente diverso, conociéndose 29 especies para México (si bien existen muchas más en el país). En contraste con la mayoría de las especies de Dialictus, las aquí descritas poseen integumento azul metálico brillante (por lo cual fueron descritas originalmente en el género Augochlora) y puntuación densa y fuerte, lo que les confiere aspecto de abejas parásitas o avispas de la familia Chrysididae. Lasioglossum (Dialictus) cyanorugosum sp. nov., L. (D.) oaxacacola sp. nov., L. (D.) verapaz sp. nov., y L. (D.) aurora (Smith) comb. nov., son descritas, ilustradas y comparadas con otras especies de Dialictus. Se presenta una clave para el "grupo de especies aurora".