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



and stigma blackish, pale at base, areolet wanting ; legs and abdo- 

 men reddish, the basal segment of the latter often more or less 

 black, as are several segments of the apical half of the abdomen ; 

 in some specimens the abdomen black, with a broad medial red- 

 dish band. 



New Haven, 24 June, 1902 (E. J. S. M.). 



D. orbitalis (Cresson). 



Male : length a little less than 4 mm. ; color as in Syrphoctonus 

 agilis, except as follows : no spot before the tip of the scutel ; the 

 greater part of the superior, anterior, and inferior borders of the 

 mesopleurse, a long mark on the scutel, a transverse mark on the 

 postscutel, and more or less of the apical margins of the second 

 and third dorsal abdominal segments, yellow or yellowish ; rest 

 of pleurae black ; legs stramineous or yellowish except the ex- 

 treme tip of* the hind femora and a basal and an apical annulus 

 on their tibiae, which are brown like their tarsi ; hind tibiae yellow- 

 ish white between the dark annuli ; malar space yellow ; face of 

 female with the inner orbits margined with yellow, greater part 

 of face below the antennae black; mesopleurae with less yellow, 

 antennae black; legs somewhat stramineous, with a part thereof 

 rather bright brownish red ; abdomen almost entirely black, other- 

 wise as in the male. 



D. (Homotropus) bicapillaris (Walsh). 



Female : length 5 mm. ; black, except as follows : clypeus 

 mostly pale, mandibles mostly yellow, palpi rather stramineous ; 

 pronotum in front with a lateral marginal stripe or mark ; tegulae, 

 tubercles, a line beneath the tegulae, a line between the meso- and 

 metapleuras, posterior edge of scutel, and a sub-basal annulus on 

 the hind tibiae, more or less yellow ; fore and mid legs, as well 

 as the hind coxae, trochanters, and femora, reddish ; hind tibiae, 

 except for the annulus, brownish and blackish, the basal sixth 

 of the annulus being the former color and its apical third the lat- 

 ter; hind tarsi black; wings with an areolet that is subpetiolate. 



West Haven, 27 June, 1905 (H. L. V.). 



D. (Zootrephes) antennatus (Davis). 



Female : length 4.5 mm. ; head and thorax mostly black ; abdo- 

 men mostly reddish, black at base and apex; face beneath an- 

 tennae and for a short distance above along the eye margins, scape 



