178 Psyche [October 



A GYNANDROMORPHOUS MUTILLID FROM 

 MONTANA.! 



By William M. Mann. 



In July, 1912, 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 deter- 

 mined as Dasymutilla euchroa Cockerell. The female of this spe- 

 cies 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 

 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 europcea 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 Cole- 

 brook, Conn., differed in having the sexes of the two sides re- 

 versed, 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. 



1 Contributions from the Entomological Laboratory of the Bussey Institution, Harvard Uni- 

 versity, No. 94. 



