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



Subfamily Rhyparochrominae. 



Key to Tribes. 



1. With the two glandular, opaque spots, laterally on the fourth ven- 



tral segment of abdomen, widely separated, posterior one placed 

 closer to posterior margin of segment than to anterior spot . 2 



Posterior glandular, opaque spot of fourth segment of abdomen 

 placed closer to anterior spot, most commonly remote from pos- 

 terior margin of segment, sometimes furnished with a third pos- 

 teriorly placed spot. With lateral margin of pronotum most 

 commonly expanded; this frequently foliaceous between the two 

 lobes . . Lethaeini, p. 733 



2. Pronotum with lateral margin of anterior lobe not obtuse or terete 



but either calloused or carinate or expanded or lateral emargina- 

 tion filled in by a foliaceous expansion or furnished within lateral 

 margin with a series of punctures or propleura with a linear 

 impression within lateral margin. Pronotum rarely strongly con- 

 stricted transversely ; rarely furnished with a constricted ring-like 

 collar, unless head is strongly exserted, or at most only provided 

 with a depressed series of punctures within anterior margin. 

 Body most commonly broad with head most commonly almost or 



quite immersed to eyes 3 



Pronotum with lateral margins of anterior lobe obtuse, terete, 

 neither calloused, carinate nor expanded nor longitudinally 

 impressed within lateral margin of propleura; most commonly 

 strongly constricted transversely to form two distinct lobes and 

 most commonly provided with a constricted ring-like collar. If 

 collar is absent then is the head not at all or very slightly 

 exserted. Body commonly less depressed, more narrow-elongate 



Myodochini, p. 723 



3. Entire lateral margin of pronotum and costa, more or less laminate- 



expanded and most commonly in part, pale; this margin rarely, 

 only keeled, in which case the first segment of antenna is extended 

 far beyond apex of head and genital segment of male is tubercu- 

 late ; pronotum including margin, most rarely entirely black, pos- 

 terior lobe most commonly pale or variegated with pale. Pos- 

 terior tibiae furnished with long rigid subspiniform setae or 



bristles 4 



Lateral margins of pronotum not at all or less entirely laminate- 

 expanded, most commonly either carinate or longitudinally 

 impressed within lateral margin of propleura. Pronotum most 

 commonly entirely black, ferrugineous or castaneous, with pos- 

 terior lobe rarely paler, punctate with black. Head rarely 

 strongly exserted, if so, then is a constricted ring-like collar 

 present anteriorly on the pronotum (Ozophora). Hind tibia 

 most commonly without rigid bristles only, most frequently pilose 



Rhyparochromini, p. 730 



4. Antennae nude or with shorter pubescence, first segment sometimes 



furnished with a few shorter setae. Lateral, more narrowly, 

 expanded margin of pronotum not at all or rarely sparingly 

 punctate; anterior disk of pronotum most commonly smooth or 



sparingly punctate, rarely densely punctate Beosini, p. 732 



Three basal segments of antennae provided with rigid, setose 

 bristles. Lateral, more widely expanded margin of pronotum and 

 corium commonly, profusely punctate. Clavus irregularly punc- 

 tate. Dorsal parts commonly pale and profusely punctate 



Goniainotini, p. y2>3 



