12 U. S. NATIONAL MUSEUM BULLETIN 216 



3. Genus Chorinaeus 



Figures 163, a; 165,a 



Chorinaeus Holmgren, 1856, Svenska Vetensk. Akad. Handl., ser. 4, vol. 1, p 

 305,320. Type: Exochus funebris Gravenhorst; designated by Viereck, 1914. 



Polyrhabdus Walsh, 1873, Trans. Acad. Sci. St. Louis, vol. 3, p. 98. Type: 

 (Polyrhabdus cariniger Walsh) = funebris carinatus (Cresson) ; monobasic. 



Front wing 3 to 7 mm. long; body punctation rather coarse; face 

 and clypeus with an even, moderately strong convexity, the face 

 produced upward over bases of antennae as a triangular flange whose 

 apical angle is about 90°; frons without a lamella between antennal 

 sockets; temple short, convex; occipital carina present above and 

 laterally, absent below; mandible of moderate size, not specialized, 

 its lower tooth a little smaller than or definitely smaller than upper 

 tooth; flagellum slender, moderately long to long; upper margin of 

 pronotum widened, with a broad, weak, submarginal impression; 

 propleurum moderately convex; scutellum parabolic in outline, almost 

 flat, its lateral carina sharp and extending to its apex; areolet absent; 

 nervulus beyond basal vein by about 0.2 to 0.35 its length; nervellus 

 broken near its lower 0.35 ; prepectal carina as in figure 165, a ; sternaulus 

 a short, weak depression next to prepectal carina; mesopleural suture 

 distinct, usually sharp; metapleurum with hairs in the upper part, 

 elsewhere mostly or quite bare; propodeal carina as in figures 163, a 

 and 165, a, the costula usually absent though occasionally more or less 

 distinct (the costula appears sporadically in specimens of several 

 species and seems to be taxonomically of little value) ; propodeal 

 spiracle short elliptic; suture between second trochanter and femur 

 of front and middle legs distinct, though weak ; tibial spurs all present ; 

 front spur of middle tibia 0.60 to 1.0 as long as hind spur of middle 

 tibia; claws of front and middle tarsi strongly pectinate, of hind tarsus 

 apparently simple; abdomen strongly convex above, parallel-sided; 

 first tergite moderately long, its spiracle near its basal 0.25, its lateral 

 and median longitudinal carinae strong from base to apex; second 

 tergite with a median longitudinal carina extending its entire length 

 and a sublateral longitudinal carina extending about 0.4 its length; 

 third tergite with a median longitudinal carina extending about 0.7 

 its length; epipleura vestigial, narrow and thick; eighth and following 

 tergites of male retracted; seventh and following tergites of female 

 retracted; sixth sternite of female large, weakly sclerotized, unspe- 

 cialized. 



The European Chorinaeus talpa (Haliday) 1839 lacks the carinae 

 on the second and third tergites but is otherwise typical of the genus. 



The coloration in the genus is rather uniform, usually black with 

 yellow face, mouth parts, cheek, basal part of tegula, apex of femora, 

 basal 0.2 of tibiae and some other, usually more vague, leg markings, 



