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



4. Abdomen with venter pale; vertex w^ithout ridges and some- 



what roughened with minute tubercles; median fovea shal- 

 low or nearly wanting; procidentia broad and strongly- 

 keeled; body shining black, with clypeus, mouth-parts, 

 pronotum, tegulae, legs, and central area of abdomen on venter, 

 pale yellowish; apical half of posterior tibiae and their tarsi, 



brownish black. Length 5 mm carolinensis 



Abdomen with venter black 5 



5. Pronotum and tegulae pale; head and thorax strongly punc- 



tate ; ocellar and frontal ridges sub-obsolete ; median fovea 

 broad and shallow; antennal segments three to five sub- 

 equal; procidentia broad, slightly excavated at tip, not 

 projecting; hypopygium notched at tip; body black, with 

 clypeus, labrum, bases of mandibles, palpi, legs in great 

 part, pronotum, and tegulae, yellowish ferruginous; tips of 



posterior tibiae and tarsi fuscous. Length 6 mm luteola 



Pronotum and tegulae black (See sec. 7) idiota 



6. Body reddish orange marked with black; head densely and 



finely, tuberculately granulate, opaque, clothed with setae; 

 ridges of ocellar basin and frontal crest almost wanting; 

 antennal segments three to five subequal; clypeus, labrum, 

 and bases of mandibles inclined to pallid; vertex in great 

 part, antennre, stripes on lobes of mesonotum, scutellum, 

 metanotum, sides of first abdominal segment, other seg- 

 ments along the middle of dorsum, lower part of pleurae, 

 and saw-guides, black or dark brown; tips of hind tibiae and 



hind tarsi infuscated. Length 6.5 mm bivittata 



Body black, marked with yellow 7 



7. Abdominal segments two to five, usually only on sides, yellow; 



head with coarse, deep punctures; ridges of ocellar basin 

 rounded, nearly obsolete; third antennal segment much 

 longer than fourth, fourth and fifth segments subequal; 

 saw-guides rather slender, rounded at tip, with a dense 

 bordering fringe of hairs; body shining black, with clypeus, 

 tegulae, legs, and abdominal segments two to five, usually 

 interrupted at middle, yellow; femora usually brown basally 

 and apically; tips of posterior tibiae and their tarsi brown or 



black. Length 5 mm idiota 



Abdomen with segments one to four entirely reddish yellow; 

 head with dense, coarse punctures; frontal crest slightly 

 elevated; median fovea shallow; third antennal segment 

 longer than fourth ; saw-guides not very broad, rounded at 

 apex, with dense bordering hairs ; body shining black, with 

 clypeus, outer half of pronotum, tegulae, abdominal segments 

 one to four, and legs, reddish j^ellow; apical third of posterior 

 ** tibiae and their tarsi black. Length 5.5 mm dyari 



