A Gynandromorphous Mutillid From Montana
Psyche: A Journal of Entomology
In July, 191, while collecting in the Elkhorn mountains near Townsend, Montana, I found a Mutillid which presents a peculiar type of gynandromorphism. The specimen was taken with several others of the same species, which Mr. Rohwer has determined as Dasymutilla euchroa Cockerell. The female of this species has the body very thickly covered with long bright red hairs. The male also has these hairs on the greater part of the thorax and abdomen, and on the occipital region of the head, but the
... e head, but the sides of the head, the epinotum, and the anterior two-thirds of the first gastric segment bear only black hairs, which are more sparse than the red ones and allow the black color of the integument to show through. Only two gynandromorphous Mutillids have been recorded. One of these, Mutilla europa L. var obscura Nyl., according to Wheeler (PsYcHE, Vol. XVII, 1910, p. 89), was divided laterally, the right side being female, the left male. The other example, Pseudomethoca canadensis Blake, which Wheeler found at Colebrook, Conn., differed in having the sexes of the two sides reversed, the female to the left. Both of these were complete, having well developed wings on the male side and even the legs of either side characteristic of the respective sex. The specimen before me is incompletely differentiated. The male side lacks wings, and all of the legs are typically male. It differs also in being a, crossed or decussated gynandromorph. The head is male to the right and female to the left, while the thorax and abdomen are male to the left and female to the right. The body of D. euchroa is so densely covered with hairs that it is impossible clearly to make out the thoracic sutures or the sculpture. The accompanying figures will give an idea of the general outline of the body from above and the head from the front. The black parts of the insect are shaded in the figures. Contributions from the Entomological Laboratory of the Bussey Institution, Harvard University, No. 94.