198 



delicate, a joint or two of tlie antennae may easily be lost or 

 may be overlooked. Taking a number of specimens of each 

 sex, what is the greatest number of joints observable in the 

 antennas of each sex ? This will best show the normal number 

 for each. Have the males ever more than nineteen, counting 

 the basal joints as two ? Have the females ever more than 

 eighteen, including the two conjoined basal joints ? Have the 

 latter indeed ever so many as eighteen ? Until these points 

 are positively determined and settled we cannot have a per- 

 fectly accurate specific description of the Hessian Fly. 



In your description of the female, in Elsworth's Report, p. 

 162, you state that the head, eyes and thorax are black ; 

 abdomen tawny red, famished irregularly with many black 

 hairs ; ovipositor rose-red color ; legs pale red, covered sparsely 

 with black hair; males less black (than the females). 



In your manuscript description (before named) you say of 

 the 9 : — " thorax niger^ politus ; abdomen fulvum, pilis atris ; 

 ovipositor roseus ; alee atro-pilosce, basi fulvce.'" S- abdomen 

 elongatum griseo-pilosum." Dr. Fitch, p. 41, says of the $ : 

 " head black throughout ; thorax black, scutel of same color and 

 slightly polished, the suture surrounding it sometimes fulvous ; 

 poisers dusky ; abdomen black above, more or less widely 

 marked at the sutures with tawny fulvous and furnished with 

 numerous, fine, blackish hairs ; ovipositor rose-red; wings slightly 

 dusky and fulvous at their insertion into the thorax ; legs pallid 

 brown, tarsi black, femurs paler at their bases." ^ ; " abdomen 

 of a brownish black color, more or less widely marked at the 

 sutures with palUd fulvous or smoky whitish lines. In all other 

 points the male coincides with the female " (in color). 



Say's description is : " head and thorax black ; wings black, 

 fulvous at base ; feet pale, covered with black hair." <? ; head 

 black, thorax black, glabrous, polished ; scutel color of thorax ; 

 wings ciliate, blackish, the fulvous color of the base sometimes 

 extended upon the nerves ; thighs fulvous at base ; poisers 

 pale ; breast sometimes fulvous ; abdomen brownish. ? ; ab- 



