144 Journal New York Entomological Society, ["^'oi- xxx. 



FFF. Apical half of last abdominal segment cylindrical, in- 

 stead of conical as in normula and meigenii; penultimate 



segment about .7 as long as the last discalis. 



AA. Last abdominal segment without a tuft of plumose hairs ; species living 



in dung, decaying vegetable matter, decaying wood, or bark or refuse. 



B. Each segment laterally with two lobes, the anterior one much narrower 



(figs. 40, 41) ; length 8.5 mm. In the penultimate instar the head is 



more tapering and the mouth parts simpler. . . AUognosta fuscitarsis. 



BB. Lateral margin not so lobed. 



C. Antennse located on disc of head well back from the margin. 



D. Outer bristle of each dorsal transverse series of abdominal seg- 

 ments not more than one sixth as long as the next bristle; inner- 

 most bristle also short (figs. 19, 20). .. Eupachygaster henshawi. 

 DD. Bristles very long, in transverse series, not so strikingly differ- 

 ent in length (fig. 10) Zabrachia polita. 



CC. Antennae located at or near the margin of the head. 



D. Antenna over three times longer than wide ; yellowish species, 

 incisures distinctly blackish, each segment marked with a small 

 spot on each side and a larger median spot, the latter on the 

 intermediate segments with clear space in the center; bristles 

 very short; length of larva 8 mm. Not reared. (Beris or 



Actinaf) Stratiomyiid I.i 



DD. Antennas short, last segment about as long as wide. 



E. "Eye" tubercles prominent, body more or less distinctly 

 longitudinally striped ; without numerous appressed scale- 

 like hairs. 

 F. Head broadest at base, tapering anteriorly, two more or 

 less prominent tubercles on each side of head (figs. 27, 



30) ; length 10 mm Macrosargus clavis. 



FF. Head at least as broad at the tubercles as at the base. 



G. Width of head about two thirds that of its length ; 



terminal abdominal segment with a distinct cleft, a 



short bristle on each apex (figs. 22, 24) ; length 8 mm. ; 



penultimate instar with slightly clavate body bristles 



(fig. 23) Microchrysa polita. 



GG. Head nearly or quite as wide as long. Geosargus. 



H. Dorsum of body with two distinct longitudinal, 



pale, more or less zigzag stripes and pale lateral 



margins ; head slightly longer than wide ; anterior 



angle of eye tubercle not distinctly reentrant (figs. 



25, 33) ; length 10 mm decorus. 



HH. Body with six distinct longitudinal, dark, zigzag 

 stripes; head about as long as broad; anterior angle 

 of eye tubercle reentrant (figs. 26, 34) ; length 



I o mm viridis. 



1 See notes below, under Beridiinae. 



