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



vatecl; antennal segments three and four subequal; saw- 

 guides broad, obtusely pointed, upper margin slightly 

 emarginate; body black, with the face below the antennae, 

 mouth-parts, orbits, angles of pronotum narrowly, tegulae, nar- 

 row apical margin of dorsal segments, two apical dorsal seg- 

 ments, venter except epimera and some dusky spots on 

 lateral margin of abdomen, and legs except apical half 

 of posterior femora and apices of tibiae and tarsi, yellowish. 



Length 5.5 mm marlattii 



Femora of all the legs pale 11 



11. Hind wings with free part of R 4 and transverse part of M a 



interstitial; ocellar basin distinctly defined; frontal crest 

 strong, unbroken ; median fovea deep, with lateral chan- 

 nels running from it over bases of antennae; antennal seg- 

 ments three and four nearly equal; body black, with tip 

 of clypeus, mouth-parts, angles of pronotum, tegulae, legs 

 in great part, venter of abdomen, and marginal third of 



dorsum of abdomen, yellowish. Length 7 mm harringtoni 



Hind wings with transverse part of M 2 separating from R a con- 

 siderable distance before free part of R 4 ; ocellar basin with 

 well defined walls ; frontal crest unbroken ; median fovea 

 oval ; antennal segments three and four sub-equal ; saw-guides 

 broad, tapering, slightly produced, with a rather dense tuft of 

 short hairs at the extreme tip ; body black, with supraclypeal 

 area, clypeus in great part, mouth-parts, tegulae, abdomen except 

 broad dorsal stripe, and legs in great part, reddish yellow. 

 Length 7 mm fylesi 



12. Hind femora black, at least apically 13 



Hind femora entirely pale *7 



13. Head with orbits pale; ocellar basin with sharply defined 



walls; frontal crest distinct, unbroken; median fovea cir- 

 cular; saw-guides smooth, polished, pointed, bordering 

 hairs minute; body black, with clypeus, mouth-parts, angles 

 of pronotum, tegulae, anterior and posterior legs (except 

 apical three-fourths of hind femora, hind tibiae, and tarsi), 

 yellowish white; central part of mesonotum and scutellum 

 sometimes yellowish brown; apical two-thirds of abdomen 

 ferruginous; hind tibiae entirely brown, pale at base, and 

 gradually darker towards apex, or white at base and grad- 

 ually shading to brown. Length 7 mm tricolor 



Head with orbits black 14 



14. Abdomen with apical segments black 15 



Abdomen with apical segments rufous 16 



15. Antennal segments three and four subequal; median fovea 



distinctly defined, oval; ocellar basin with sharply defined 

 and strongly raised walls; frontal crest prominent, sharp, 

 unbroken; saw-guides short, obtusely pointed, quite 



