294 



FAMTLY IX. SCYDlLENIDxE. 



cc. Head almost as wide as thorax: secondary male characters con- 

 fined to the sixth ventral; antennal club stronger, more abrupt 

 and more bead-like. bicolor. 

 bl). Elytra very pubescent; head with dense, stiff hairs directed back- 

 ward; clypeo-frontal suture absent; antennae with a short abrupt 

 club, the eighth and ninth joints subequal in width. 

 c. Larger, 1.6 mm. ; elytra not concave toward base ; eighth antennal 

 joint as large as ninth. 570. occultus. 



ee. Smaller, not over 1.2 mm. ; eighth antennal joint distinctly smaller 

 than ninth. 571. similis. 



aa. Antennal club 3- jointed. 



f. Head and elytra glabrous ; thorax with four basal foveas; antenna? 

 long and slender, the joints all longer than wide. 



572. SALINATOB. 



ff. Head and elytra distinctly but sparsely pubescent; thorax with a 

 well defined carina each side extending obliquely to base ; antennal 

 club darker in color than the stem. 

 g. Eighth antennal joint fully as long as wide; elytra not inflated. 



573. fatutts. 



gg. Eighth joint distinctly wider than long, the club stouter. debilis. 



568 (1838). Euconnus clavipes Say, Long's Sec. Exped., II, 1824, 272; 



ibid. I, 179. 



Oval, feebly inflated. Head black ; thorax and under surface piceous ; 

 elytra dark reddish-brown, shining, the sides and tips blackish; antennae 

 and legs reddish-brown. Antennas slender, three-fifths as long as body, the 

 last four joints longer than wide and one-half thicker than those of stem. 

 Thorax as long as wide, narrowed at base, broadly rounded in front, the 

 foveas deep, distinct. Elytra two-fifths longer than wide, each with a small 

 deep fovea at middle of base and a rather strong humeral fold. Four front 

 femora strongly club-shaped. Length 1.5 mm. 



Lake. Marshall and Crawford counties : frequent in Lake, scarce 

 in the others. March 26-May 28. The fourth and fifth ventral 

 segments of males each bear a short, thick discal plate, subdentate 

 on sides. 



569 ( ). Euconnus semibuber Casey, Ann. N. Y. Acad. Sci., IX, 1897, 



368. 



Oval, rather robust. Black, shining, not punctate; elytra dull red; 

 antenna? and legs reddish-piceous. Head not quite as long as wide; an- 

 tennas slender, half the length of body, the club loosely formed, its joints 

 gradually larger. Thorax as long as wide, feebly narrowed at base; trans- 

 verse impression distinct, the foveas minute. Elytra two-fifths longer than 

 wide, twice as wide as thorax ; humeral fold long and strong ; subhumeral 

 impression long~ wide and deep. Length 1.3-1.5 mm. 



Marion County; scarce. December 1. Taken in nest of ants 

 from beneath beech log. Described from northern and central 

 Illinois. 



