4 University of Michigan 



wings 12-13, of hind wings 10-12; distal thickened antenodal 

 the fifth in the four wangs of the male and one hind wing of 

 the female ; in both front wings of the female it is the sixth, 

 and in one hind wing it is the fourth. 



The wings of both tristani and sabaleticus are narrower 

 than in other species of the genus known to me. In plate I, fig. 

 4, crotalinns is figured for comparison with sabaleticus. The 

 narrower wnng results primarily from a reduction of the anal 

 area with consequent modifications of distal posterior parts 

 adjusting themselves to this reduction. In my male specimen 

 of tristani there are in the hind wings 10 marginal cells be- 

 tween Cuo and A^ ; in the male of sabaleticus there are 12 in 

 one hind wing and 1 1 in the other, in the female there are 

 12 and 13. 



The following general description of the living colors of the 

 male was made as soon as the specimen could be safely remov- 

 ed from the cyanide bottle. Eyes above dark dull blue, gray 

 beneath. Face dark brown, frons green. Thorax rich dark 

 brown marked w^ith brilliant grass-green. Abdominal seg- 

 ments I and 2 and base of 3 brown ; apex of 3 and 4-6 black ; 

 dorsal markings 1-6 green; basal lateral spots 3-6 light gray 

 or pearl, on 3 with a greenish cast ; basal area of 7 pale green 

 above, sides gray like preceding lateral spots ; apical part of 7 

 dark brown, 8 paler, 9 still paler and 10 light reddish brown, 

 narrowly black at apex. 



Throughout the above description it has been assumed that 

 the student had before him Calvert's figures, description and 

 discussion of Erpctogornphus tristani (Entomological News, 

 Vol. XXIII, July, 1912, plate XVII, pp. 289-295). In view 

 of the close relationship of tristani and sabaleticus, Calvert's 

 paper and the present article are in a sense complementary. 

 The two species seem inseparable on any other character than 



