19151 



Mann — A Gi/nandromorphoi/s MnliUid from Montana 



179 



The right (male) side of the head is much shorter than the left. 

 The right eye is larger than the other, the antennae long and 13- 

 jointed and the mandible short, with three teeth toward the apex. 

 The median ocellus is perfect, though somewhat smaller than in an 

 ordinary male. There is one lateral ocellus on the male side. On 

 the female side the head is longer, the antennae are shorter and 

 12-jointed, the eye small, located a little farther back than the 

 other, and the mandible is much longer and more slender, with a 



fig. 1. Dasymntilla cnchroa CklL, gynandromorph. 



single sub-apical tooth. The pilosity of the head is black, except 

 for spaces on the left of the occiput and front and a few scattered 

 red hairs on the occiput to the right of the median line (the latter 

 characteristic of the male). The clypeus, antennae and both man- 

 dibles are black. 



Each side of the thorax is not so evidently distinct from the 

 other as in the head, because in both sexes occurs the heavy cover- 

 ing of red hairs. In general shape it is asymmetrical, the epinotum 

 is more rounded on the left side and is black along the margin. 

 The petiole is male to the left and female to the right, and is pecul- 

 iarly twisted. The differences between the sides of the abdomen 

 are more apparent. The large black spot on the left half of the 

 first segment is typical of the male. There is a strong constriction 



