230 MEMOIRS ON THE COLEOPTERA 



and as long as the two preceding; prothorax not quite twice as wide as 

 long, rounded at base, the sides only moderately converging from base 

 to apex and evidently arcuate; elytra subparallel, with feebly arcuate 

 sides, the base exactly equal to the thoracic base, the suture nearly two- 

 fifths longer than the pronotum; abdomen as long as the anterior parts, 

 parallel, with nearly straight sides, not quite as wide as the elytra. 

 Length 0.9 mm.; width 0.28 mm. Iowa (Iowa City), Wickham. 



My single specimen was sent to me by Prof. Wickham as having 

 been taken from "Nest IV"; it therefore occurs, at least occasion- 

 ally, in the nests of ants. 



Oligota californica n. sp. Somewhat fusiform, convex, shining, dark 

 piceous-brown to black, the elytra a little paler, the abdomen black, 

 flavate at apex, the legs pale; punctures very fine, rather close, those of 

 the elytra finely but more strongly and a little more sparsely asperulate, 

 the abdomen with the usual imbricate sculpture; head rather small, 

 three-fifths as wide as the prothorax, the eyes as usual ; antennae infuscate, 

 pale basally, the second joint less than one-half longer than the first, 

 seventh wider than the sixth, short and strongly transverse, seven to 

 tip increasing slowly in width, seven to ten rapidly in length, the ninth 

 two-fifths wider than long, the club moderately abruptly formed; pro- 

 thorax rather small, more than twice as wide as long, of the usual out- 

 line; elytra at base equal in width to the base of the prothorax, the suture 

 almost one-half longer; abdomen slightly tapering, with feebly arcuate 

 sides, at base almost as wide as the elytra, at the fifth tergite three-fourths 

 as wide as at base. Length 0.85-0.9 mm.; width 0.3-0.34 mm. Cali- 

 fornia (San Francisco). 



Not at all closely related to the preceding but rather closely to 

 several of the following forms; the sculpture is very much finer 

 than in puncticollis. 



Oligota congruens n. sp. Rather more slender, convex, more shining, 

 nearly black, the elytra but just visibly picescent, the abdominal tip 

 pale only from the apical margin of the fifth tergite, the legs piceous; 

 sculpture nearly as in the preceding; head larger, nearly two-thirds as 

 wide as the prothorax, the antennae pale, blackish apically, the seventh 

 joint only moderately transverse, but little more than half as wide as 

 the eighth, the club rather abruptly formed, the eighth and ninth joints 

 mutually subsimilar, about one-half wider than long and obtrapezoidal; 

 prothorax larger and less transverse, convex, barely twice as wide as 

 long, the sides less converging from base to apex, arcuate; elytra larger, 

 parallel, with feebly arcuate sides, similar in basal relationship with the 

 prothorax, the suture a third longer than the latter; abdomen at base 

 slightly narrower than the prothorax, very feebly tapering thence to 

 the tip, with almost straight sides, the fifth tergite fully four-fifths as 

 wide as the base. Length 0.8 mm.; width 0.28 mm. California (Po- 

 mona, Los Angeles Co.), Fall. 



