1 88 MEMOIRS ON THE COLEOPTERA 



The type of this species is a female, but it is so very distinct in 

 elytral coloration that there could be no mistaking it; the general 

 structure, punctuation and proportions of the parts, show that it is 

 allied to sternalis, though perhaps more closely to plagifera than to 

 any other; the combined elytra are evenly pale, with four rounded 

 black spots. 



Eyes sinuate; antenna (cf) almost perfectly symmetric. 



Trogoderma frosti n. sp. Body large in size for the present genus, 

 oblong-oval, similarly rounded before and behind, less convex than usual, 

 shining black; head but little more than a third as wide as the prothorax, 

 flat, the punctures strong and deep, separated by about their own di- 

 ameters, the ocellus distinct; antennae (9) short and thick but of the 

 usual structure; prothorax barely twice as wide as the median length, 

 the sides strongly converging and strongly, evenly arcuate from base to 

 apex, the basal lobe well developed; pubescence sparse and but little 

 variegated, inconspicuous; punctures extremely minute, sparse; elytra 

 broad, two-fifths longer than wide, slightly wider than the prothorax and 

 not quite three times as long; humeral callus rather prominent but obtuse; 

 apex rapidly and very broadly rounded ; surface with small deep punctures, 

 separated by from two to three times their diameters and three or four 

 times as wide as the pronotal punctures; transverse irregular pale bands 

 narrow and incomplete, disposed somewhat as in inclusa and similarly 

 pubescent, but the subapical fascia is without oblique posterior offsets 

 including a rhomboidal area, as is the case in that species; under surface 

 deep black, unusually convex, finely, rather sparsely punctate throughout, 

 shining and inconspicuously pubescent. Length (9 ) 3.2 mm.; width 1.7 

 mm. Massachusetts (Framingham), C. A. Frost. 



This species is v^ery distinct but associable with inclusa Lee., dif- 

 fering in its larger size, slightly less convex upper surface, less trans- 

 verse prothorax and much finer and sparser punctuation of the elytra 

 and of the entire under surface. 



Trogoderma nigrescans n. sp. Female oblong-oval, rather strongly 

 convex and shining, black above and beneath; elytra black throughout, 

 without evident paler lines, but with the very decumbent and rather short 

 white hairs disposed in similar irregular transverse lines, the more erect 

 dark hairs of the general surface not at all conspicuous; head two-fifths 

 as wide as the prothorax, feebly convex, not coarsely but strongly, deeply 

 and rather closely punctate, more finely and sparsely so toward base, 

 the ocellus distinct and, just before it, there is a feeble indentation of the 

 surface; antennae rather short, the compact fusiform club clearly 5-jointed; 

 prothorax somewhat more than twice as wide as long, the rapidly con- 

 verging sides evenly and rather strongly arcuate from base to apex; 

 pubescence rather long and coarse but very sparse and inconspicuous; 

 punctures sparse and very minute; elytra short and broad, barely a third 



