MYDAID^l G3 



TABLE OF GENERA. 



1. Terminal segment of the 9 abdomen with a circlet of spines. . 2 

 Terminal segment without circle of spines.* . Mydas Fabricius. 



2. A small cross-vein runs into the hind margin of the wing between the 



anal cell and the tip; hind tibiaj of 9 with spurs. 



EcTYPHUs Gerstaecker. 

 No such small cross-vein ; hind tibiie of 9 without spurs at the tip. 



Leptomydas Gerstaecker. 



21. BOMBYLIID^. L^^ .^cwo 



Medium sized to small flies ; often with abundant, long, del- 

 icate pile. Head as broad or narrower than the thorax, often 

 spherical in shape, closely applied to the thorax. Eyes large, 

 often contiguous above in tlie Z and rarely also in the 9. 

 Antennae porrect, usually of but moderate length ; third joint 

 simple; style usually small and indistinct and sometimes 

 wholly wanting. Ocelli present. Proboscis usually project- 

 ing from the oral cavity, and slender; sometimes elongate; 

 at other times short, with broad labella. Abdomen composed 

 of from six to eight segments, slender in a few genera only. 

 Legs moderately long, weak, with short, Aveak bristles or 

 spines. Pulvilli sometimes rudimentary, the enipodia almost 

 always so, the tarsi and claws small. Tegulie small. Wings 

 often with dark markings ; two or more submarginal, three or 

 four posterior cells present; discal cell present in all our 

 genera ; anal cell closed in or near the border of the wing, or 

 narrowly open. 



The family Bombyliida3 comprises about fifteen hundred 

 known species. Most of them are swift flying insects, often 



* "Generis Ectij}i}ii proximum, ditfert : antennis elongatis, segmento pe-\ 

 nultimo cylindrico, ultimo, ^, circiter duplo longiore, conipresso, basi ' 

 parum dilatato, apice obtuse/'acuminate 9 > fhiplo breviore, obtusiore, abdo- 

 minis segmento ultimo iruerml, cyathiformi, utrinque, i)arum dilatato. 

 Long. c2o mm. undique niger, abdomine nitente, alls violaceo micanti- 

 bus, extremo apice albidis — P. phyllocerus, Rocky Mts." 



RlIVLLOMlDAS Bigot. 



