74 Bulletin of the Brooklyn Entomological Society Vol. XII 



Key to the Genera. 



1. Lateral borders of pronotum wide, more or less flaring, and with 



carinae 2. 



Lateral borders of pronotum distinctly rounded, and without carinae, 



Lidopus n. g. 



2. Anterior border of pronotum much narrower than posterior; lateral 



borders if produced would meet at a point on the front of the head, 



Myiomma Put. 

 Anterior border of pronotum slightly narrower than posterior; the lat- 

 eral margins if produced would meet at a point considerably before 

 the front of the head Isometopus Fieb. 



Genus Lidopus n. g. — Form ovate. Head very short, vertical, front de- 

 pressed beneath. Base of vertex higher than anterior margin of pronotum. 

 Rostrum extending to posterior coxse. Ocelli distinct but not prominent 

 or raised. Eyes large, distance between them less than width of an eye. 

 Antennae with second joint longest. Head fitting snug against the pro- 

 notum. Pronotum narrowed anteriorly but little, if sides were produced 

 they would meet at a point considerably before front of the head. Lateral 

 margins of pronotum broadly rounded with but a slight trace of a carina. 

 Scutellum with sides equilateral. 



Type of the genus is heidemanni n. sp. 



This genus resembles Myiomma in form and general shape 

 of the head but differs from it as well as from Isometopus by 

 the extremely convex pronotum with broadly rounded lateral 

 margins. 



Lidopus heidemanni n. sp. — Head short, compact, vertical, and more or 

 less depressed beneath. Front nearly flat. Eyes large, distance between 

 them less than the width of an eye. Ocelli small but distinct. Antennae 

 with the first joint the shortest and the second twice as long as the others 

 taken together, fourth shorter than the third, second joint gradually swollen 

 towards the apex. Rostrum reaching to the first abdominal segment. 

 Pronotum strongly convex above with lateral margins broadly rounded 

 and with but a slight trace of a carina, lateral margins if produced would 

 meet at a point considerably before the front of the head. Pronotum and 

 scutellum evenly punctate. Scutellum with sides equilateral and raised 

 above the elytra. Elytra nearly flat, costal margins somewhat flaring. 

 Membrane extending for nearly half of its length beyond the cuneus. 

 Legs short. Posterior femora swollen. Length of female 2.3 mm. from 

 front of head to apex of elytra. Male 2 mm. Width across posterior 

 margin of pronotum .75 mm. 



Color. — Head, pronotum and scutellum dark reddish brown to black. 

 Apex of head lighter brown. Second and fourth antennal joints dark. 



