194 Journal New York Entomological Society. [Voi iv. 



is mentioned on the center of tlie vesicle ; none is seen in the Ithaca 

 species ; the basal fascia of the front is said to be triemarginate, such 

 cannot be affirmed of the new form ; nor has the latter a black margin 

 on the labrum, and the dorsal carina is not unusually high. However, 

 G. amtiicola must be more closely related than any of the preceding 

 species. G. lividiis differs considerably in markings, etc.; it is, rather, 

 a southern species. 



To the other three species, G. brevis, albistyliis and ncevins, the 

 Ithaca form is closely allied. The last two of these are known only 

 from the female. But they are all too small ; G. albistyliis, which is 

 the largest, has the abdomen of 29 mm. long; in the Ithaca species it is 

 33 to 35 mm. long. G. albistyliis has various black markings around 

 front and mouth-parts, also a yellow spot in middle of vertex, these not 

 present in the new species ; besides the prothorax is differently spotted, 

 the stripes on the dorsum of thorax different, different abdominal mark- 

 ings, and the vulvar lamina is different. G. ncevius is similar to the 

 preceding species, but the vulvar lamina is still shorter and rounded at 

 the tips ; this species is still smaller, abdomen only 25 mm. long ; other 

 differences the same as in G. albistyliis. G. brevis has the abdomen 

 26 mm. long, the pterostigma pale yellow, various markings on front and 

 near mouth, in the $ a tooth behind the eye near the occiput, the 

 border of occiput straight ; none of these apply to the Ithaca species, 

 nor will the markings on thorax and abdomen agree with it. 



Qomphus descriptus, sp. nov. 



Abdomen $ and 9 32 to 35 mm. long (exclusive of appendages). Hind wing 

 30 to 31 mm. long. Pterostigma yellow brown, about 3 mm. long, over 3 to 4 cells 

 in $, over 5 in 9 ; two rows of discoidal cells; 12 to 14 antecubitals, 10 to li post, 

 cubitals. Front and mouth-parts uniform greenish, except brown tips to mandibles, 

 base of front above narrowly black ; vertex black, sometimes pale near base of occiput; 

 occiput yellowish ciliated with black; behind eyes yellowish, black toward occiput 

 vescicle rounded, slightly rounded and elevated at each end ; border of occiput in 9 

 slightly concave in the middle, in $ wholly and evenly convex ; no spines on vertex oi 

 9 . The prothorax black, a long spot in front, a double one in middle, and a larger one 

 on each side yellowish. Thorax greenish, more yellowish behind, with dark brown 

 stripes as follows : a median one, bifid behind where the carina parts, wider in front, 

 narrowly reaching the front margin, and thus connecting to the antehumeral ; there 

 is always a little portion of the dorsal carina, in front of its highest point, yellow ; a 

 broad antehumeral stripe projecting inwaids above, connecting above to the narrower 

 humeral stripe, and sometimes below, leaving only a short green line ; aline on sides 

 before the stigmata, bent above ; another line on the posterior suture. The anterior 

 femora are usually greenish behind, and in the 9 the posterior ones in front. The ab. 

 domen is black, in $ there is a yellow stripe above on i and 2, a line, often not reach- 



