242 MEMOIRS ON THE COLEOPTERA 



4 Elytra uniform in color, black or pale, subvittate or nubilously 

 maculate 5 



Elytra uniformly black, margined abruptly at base, apex, externally and 

 more narrowly along the suture, with brick-red, the coloration 

 notably constant 12 



5 Prothorax less developed and more convex, the subbasal prominences 

 moderate, less widely separated and merely convex 6 



Prothorax relatively larger, the prominences more acutely elevated, more 

 widely separated and with the intervening concavity always more 

 densely punctate and pubescent, these thoracic characters, as in the 

 preceding group, asexual in development II 



6 Head subquadrate, the tempera much less prominent than the eyes 

 but parallel and straight behind them for a considerable distance, 

 then rather abruptly rounding to the broad neck. Body deep black, 

 the legs testaceous, black at the apices of all the femora and tibiae, the 

 tarsi, entire abdomen and antennae basally deep black; elytra tes- 

 taceous, with a broad common sutural stripe, vanishing before the 

 apex, and a feeble nubilous submarginal streak, not attaining base 

 or apex, black or infuscate; pubescence very short, coarse, pale and 

 sparse; head finely, loosely punctate, broadly impressed at each side 

 of the front; antennae (9 ) slender, piceous distally, barely more than 

 half as long as the body; prothorax as long as wide, narrowed and 

 strongly constricted at apex, slightly wider than the head, the 

 sides broadly arcuate; surface finely but deeply, sparsely punctate, 

 with an impunctate median line, alutaceous in lustre like the head; 

 elytra one-half wider than the prothorax and nearly four times as 

 long, just visibly cuneiform, rounding apically, the sharply defined 

 truncatures sinuate; abdomen rather closely but very finely punc- 

 tulate; legs slender. Length ( 9 ) 8.8 mm.; width 2.8 mm. Colorado 

 (Boulder Co.), F. Y. Parker parkeri n. sp. 



Head suboval, with similarly very prominent eyes, behind which the 

 much less prominent tempora rapidly and somewhat arcuately con- 

 verge to the relatively narrower neck 7 



7 Thoracic prominences somewhat more widely separated, the elytral 

 punctures remarkably fine, sparse; sinus at the apex of the fifth 

 male ventral less abrupt and rather shallow. Body black, shining, 

 the tibiae and tarsal joints testaceous, blackish at the tips, the femora 

 black, rufous at base; head finely but deeply, somewhat sparsely 

 punctate, the antennae (cf ) three-fourths as long as the body, pale 

 piceo-testaceous, black basally; prothorax barely as wide as the 

 head, moderately narrowed and constricted at apex, the punctures 

 rather small but perforate, sparse, irregular in distribution; elytra 

 but little more than twice as long as wide, three-fourths wider than 

 the prothorax, very moderately cuneiform, the truncatures trans- 

 verse; color piceous-black, nubilously testaceous discally toward base, 

 at apex and along the marginal bead; punctures becoming larger 

 internally toward base as usual. Length (cf ) 7.4 mm. ; width 2.4 mm. 

 Lake Superior lacustrina n. sp. 



Thoracic prominences a little less widely separated; elytral punctures 



