No. 64] DIPTEKA OF CONNECTICUT : TAXONOMY 181 



78. Postocellar bristles parallel, divergent or absent 79 



Postocellar bristles convergent LAUXANIIDAE 



79. Clypeus never prominent; femora with bristles £0 



Clypeiis very prominent; femora without bristles DRYOMYZIDAE 



80. Ovipositor fiat and wide; front long and moderately narrow; head 



short, hemispherical, the antennae never porrect; shining blackish 



flies LONCHAEIDAE 



Ovipositor not prominent; front wide; head more or less orbicular or 

 the front produced; antennae usually porrect; very rarely shining 

 black TETANOCERIDAE 



81. Antennae situated on the eye-stalks or at their base DIOPSIDAE 



Antennae situated on the front, though widely separated, regardless 



of the presence of eye-stalks 82 



82. Ocelli absent PYRGOTIDAE 



Ocelli present 83 



83. Postocellar bristles convergent or absent 84 



Postocellar bristles divergent or parallel 85 



84. Posterior femora swollen and spinose beneath; abdomen clavate; 



small, slender flies MEGAMERINIDAE 



Posterior femora not swollen and spinose; abdomen short and rather 

 broad, never clavate CHAMAEMYIDAE 



85. Presutural dorsocentrals absent or the subcostal and first veins end 



far apart OTITIDAE 



Presutural dorsocentrals present or the thorax bearing very long, 

 fine pile PALLOPTERIDAE 



86. Metascutellum developed, appearing as a strong convexity below the 



scutellum; hypopleura with strong bristles TACHINIDAE 



Metascutellum weak or absent, or if developed there is only hair on 

 the hypopleura 87 



87. Oral opening and mouth parts very small; hypopleura with abundant 



long hair 88 



Oral opening normal; hypopleura with a row of bristles or only short, 

 sparse hair 89 



88. Scutellum extending far beyond the base of the metanotum; metascu- 



tellum never developed CUTEREBRIDAE 



Scutellum very short; metascutellum usually strongly developed; palpi 

 usually large OESTRIDAE 



89. Hypopleura with a row of bristles , 90 



Hypopleura with fine, short hair or bare 91 



90. Apical cell strongly narrowed apically METOPIIDAE 



Apical cell not at all narrowed apically MUSCIDAE 



91. Oral vibrissae absent; mesonotum without bristles except above the 



wings PSILIDAE 



Oral vibrissae present; mesonotum with bristles MUSCIDAE 



PUPIPARA AND FLIES WITHOUT OR WITH ABORTED WINGS 



92. Coxae widely separated by the sternum; usually parasitic on warm 



blooded animals ^^ 



Coxae approximate basally; not parasitic on warm blooded animals 

 (except Streblidae) 96 



93. Mesonotum short, resembling the abdominal segments; antennae in- 



serted in lateral grooves BRAU LI DAE 



Mesonotum and abdomen differentiated 94 



94. Head small and narrow, folding back into a groove on the mei^onotum; 



prosternum produced NYCTERIBIIDAE 



Head not folding back in a special groove; prosternum not produced.. 95 



95. Palpi broader than long; wings uniformly veined STREBLIDAE 



Palpi elongate, forming a sheath for the proboscis; wing veins crowd- 

 ed anteriorly, weak or absent posteriorly HIPPOBOSCIDAE 



