ENDOMYCHID/E 141 



gradually very slightly increasing; club long and loose, the ninth joint 

 fully as long as wide, obtriangular, tenth obtrapezoidal, wider than long, 

 the last well developed, obliquely pointed at tip; prothorax not quite 

 twice as wide as long, the sides parallel and nearly straight, rounding in 

 almost anterior half to the transverse apex, which is much narrower than 

 the base; surface with a slender furrow along the straight basal margin, 

 terminating at each side in a triangular sulcus; sides rapidly declivous to 

 the coarse arcuate gutter in anterior two-thirds, the expanded posterior 

 end of the gutter coarsely foveiform; surface with very minute sparse 

 punctures throughout; scutellum small, strongly transverse; elytra 

 widest near basal third, the sides arcuate, gradually rounding and con- 

 verging thence posteriorly, the apex obtusely ogival; surface with fine 

 sparse confused punctures throughout and a fine subsutural stria, which 

 is impunctate and flexed strongly outward at base; mesosternum broad 

 and finely bicarinulate between the coxae. Length 1.4-1.7 mm.; width 

 0.75-0.9 mm. Colorado (Denver). Ten examples, of which three bear 

 the label "found on a vessel near Key West," which is unaccountable to 

 say the least. 



There is no eastern species to which this is allied in any way 

 closely. The male has a small indentation adjoining the suture 

 near the apex, the impression enclosing a minute and strongly 

 elevated tubercle. The coarse gutter along the sides of the elytra 

 terminates abruptly in a strong fovea under and behind a rather 

 pronounced humeral callus. 



The three following species differ greatly from the preceding in 

 having the median part of the pronotum more closely and strongly 

 punctate than the rest of the surface: 



Symbiotes lacustris n. sp. Rather broad, oblong, moderately convex, 

 shining, pale testaceous, the erect hairs rather long, coarse and yellowish; 

 head minutely, remotely punctulate, three-fifths as wide as the prothorax; 

 antennae distinctly longer than the head and prothorax, the second joint 

 very much shorter and narrower than the first, about as long as the next 

 two together, third barely longer than wide and scarcely longer than the 

 fourth, three to six closely joined, subequal and subquadrate, the seventh 

 but slightly larger, the eighth shorter and transverse, ninth obtrapezoidal, 

 wider than long, the tenth as long as the ninth but wider, the eleventh 

 as long as the two preceding, stout, very obliquely pointed; prothorax 

 slightly less than twice as wide as long, the subparallel sides feebly 

 arcuate, becoming broadly rounded and converging anteriorly, the narrow 

 basal groove joining the deep triangular sublateral sulci, the very coarse 

 marginal gutter becoming finer and shallow basally and expanded at 

 basal third into a large deep fovea; surface evenly convex, minutely, 

 remotely punctate, except medially, where the punctures become rela- 

 tively coarse, deep and close-set; scutellum short, transverse; elytra 

 oblong, only very slightly wider than the prothorax and somewhat more 

 than three times as long, the parallel sides very feebly arcuate, rather 



