8 DIPTERA OF NORTH AMERICA. 



seen species of the genera Campy'lomyza, Zygoneura and Les- 

 tremia. Of a new genus belonging to the same section, I have 

 seen only one incomplete individual. 



Fam. IV. BLEPHAROCERIDAE. 



Charact. — Ocelli three. Wings very ample, naked (?'. e. with hairs only 

 perceptible under a very highly magnifying lens), with cracks 

 caused apparently by folding ; no discoidal cell. Posterior tibiae 

 with stout spurs, anterior tibice unarmed. 



The genus Blepharocera Macq. cannot, except by the utmost 

 constraint, be included in any of the existing families. Its nearest 

 relation is the Ceylanese genus Tanyrhina Loew. I unite these 

 two genera in one small family, the name of which I derive from 

 the older of the two. The Blepharoceridce differ from the Cecido- 

 myidce by the stout terminal spur of their posterior tibia?, from 

 the Mycetophilida by their coxse not being elongated, from the 

 Bibionidce by the want of an empodium and pulvilli, and by the 

 very little development of their prothorax. In the form and tissue 

 of their wings they are most nearly allied to the Simulidce, but by 

 the existence of ocelli, and by the long slender legs, they seem to 

 me to differ from them too much to be reunited w 7 ith them. The 

 neuration of their wings is rather similar to that of the Cecido- 

 myidce ; but Blepharocera has some more longitudinal veins, and 

 thus its neuration resembles that of Macropeza. Besides the longi- 

 tudinal veins, the wings show some fine cracks, perfectly similar in 

 both, and looking as though produced by the expansion of the 

 wings, which had previously been folded ; this mark is peculiar to 

 them, pointing to some peculiarities in their transformation un- 

 fortunately still unknown ; some certainty about the place due to 

 them in the system may, therefore, be expected from the knowledge 

 of their earlier stages. 



I know only one N. A. species of Blepharocera very much 

 resembling that species which is spread over a great part of Eu- 

 rope. Blepharocera americana Walk, neither belongs to this 

 genus, nor even to this family. 



