304 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



L. (Prionokfbis) w alley i Alex. (Fi<2:. 45, N). 



1929. Limnophila {PHonolahis) icaUeyi Alexander: Bull. Brooklyn 

 Ent. Soc, 24:187-188. 



In its relatively small size and i^eneral appearance, most resem- 

 bling simplex but with the inner dististyle of the male hypopygium 

 bifid as in mfibasis. Mesonotal praescutum dark yellowish gray 

 pruinose, without stripes. Wings grayish yellow, inconspicuously pat- 

 terned with darker : stigma small but well-defined. Male hypopygium 

 (Fig. 45, N) with the outer dististyle weakly and irregularly pectinate. 

 $. L. 6.5-7.5 mm.: w. 7-8 mm. 



(May, June) Ont., and N. Y., westw. to Mich, and 111., soiithw. to N, C. 



Subgenus Phylidorea Bigot 



1854. Phylidorea Bigot; Ann. Soc. P]nt. France, 1854: 456. 



The subgenus Phylidorea^ as typified by the European ferruginea 

 (Meigen) includes, in the Northern Hemisphere, a large number of 

 species that are very difficult of exact definition. In general, the flies 

 are shiny reddish or yellowish, with gray heads, and with the an- 

 tennae beyond the scapal segment yellowish to brownish yellow. Only 

 two of the numerous local species have the body-coloration gray, and 

 one of these (suhcosfafa) is atypical. The various species fall into 

 more or less natural groups that are separated primarily on the struc- 

 ture of the male hypopygium. These groups, as represented in the 

 present fauna, are as follows: 



1. The siibcosfata group. Male hypopygium with the outer dististyle slender, 

 entirely blackened, bifid at apex. Aedcagus elongate, much exceeding the 

 dististyle.s in length ; gonapophyses simple, stout, at apex with many ir- 

 regular denticles (Fig. 46, K) subcostata 



2. The liifea group. Male hypopygium with the aedeagus very long, subtended 



at near midlength by an expanded flange that is armed with small, retrorse. 

 spinous points ; at base of aedeagus with three short, blackened, spike-like 



apophyses. (Fig. 46, E) lutea 



L. fratria also presumably falls here, agreeing in its general features, but 

 differing in the nature of the gonapophyses (Fig. 46, D). 



3. The adusta group. Male hypopygium with the aedeagus and subtending pair 



ot apophyses very greatly elongated, in length exceeding either of the 

 dististyles ; basal apophyses simple or but inconspicuously branched at apex 

 or beyond midlength (Fig. 46, A, B, F) adusta; caudifera; neadusta 



4. The similis group. Male hypopygium with the aedeagus and subtending pair 



of apophyses short, not or but slightly exceeding the dististyles in length : 

 basal apophyses profoundly bifid (Fig. 46, C, I). 



A. The cntisimilis subgroup. — Femora blackened, yellow basally (except in 

 nigrngenicitlafa) ; cord and vein Cu of wings not darkened. 



consimilis; fumidicosta; luteola; nigrogeniculata; persimilis 



B. The siniilis subgroup. — Femora yellow, with a narrow dark ring at or 



immediately before tips; cord and vein Cu of w-ings narrowly seamed 

 with darker adustoides; auripennis; iowensis; simiiis 



5. The fuh'onervosa { pi aty phallus) group. Male hypopygium with the aedeagus 



greatly compressed, in outline appearing pod-shaped or reniform, least modi- 

 fied in noz'ac-aufjliac ; gonapophyses very like those of the similis group, 

 of which this is obviously an offshoot (Fig. 46, G, H, J). 



novae-angliae; platyphaMus; siouana; and presumably terrae-novae 



