348 



NEW YORK STATE MUSEUM 



Giles and Theobald are both of the opinion that there is but one 

 European species, and as our species in both adult and larval form 



Fig. 83 Wing of Corethra karnerensis 



presents soine difference from specimens sent us by Dr Meinert of 

 Copenhagen, Denmark under the name of M o c h 1 o n y x 

 culiciformiSjWe have decided to characterize it as new. 



The adults agree very closely, but we 

 find that in the male of C. c u 1 i c i- 

 f o r m i s the posterior cross vein is less 

 than its own length from the mid cross 

 vein, while in our species this distance 

 is greater than its length. The tip of the 

 posterior marginal cell is nearer the base 

 of the wing in C. c u 1 i c i f o r m i s , 

 whereas in C. karnerensis the tip 

 of the anterior marginal cell is nearer the 

 base of the wing. The larvae present 

 more striking differences than the adults. 

 The peculiarly dentate scales bordering 

 the labial plate inC. culiciformis 

 have about eight apical teeth, whereas in 

 C. karnerensis there are but three 

 or four. The mandibles of C. culici- 

 formis have from seven to eight teeth, 

 and in C. k a r n e r e n s i s there are 

 eight to nine. Other differences would 

 probably be detected with abundant ma- 

 terial of this American species, which is unfortunately lacking 

 at the present time. 



Fig. 84 Last tarsal seg^ 

 ment and one claw of C, 

 karnere nsis 



