108 MR. HALDEMAN'S DESCRIPTIONS OF COLEOPTERA. 



lateral margins rufous, and with the posterior one, ciliate : elytra sulcate and 

 punctate-clathrate, interstices flattened convex : inferior parts castaneous, anterior feet 

 a little paler. In P. interruptus Say, (Boston Journ. N. H. i. 178,) the intervals have 

 a row of punctures and their margins are somewhat crenulated. 



TRICHOPTERYX Kirby. 



T. FUSciPENNis Hald. Ovate, shining black, elytra pale fuscous, feet rufous. I hn. 

 long. Hah. Pennsylvania. Form of T. attenuata Gillmeister, Trichopterygia, pi. 3, 

 fig. 5. Surface covered with elevated points running transversely in irregular lines : 

 antennae dark fuscous, base rufous : pronotum convex, pubescent laterally, basal 

 angles pale, acutely produced : scutel large, black, and pubescent : elytra pale fuscous, 

 punctate, and pubescent : abdomen exposed, narrow, pubescent above. The 

 prothorax has the basal angles rather more acute than in Gillmeister's fig. a, pi. 3; it 

 is wider than the elytra, and without hair, except laterally ; with a high magnifying 

 power it is distinctly aciculate, and in certain positions the elevated points resemble 

 impressions. 



T. ROTUNDATUS HaU. Broad oval, shining black, densely punctured, pubescent, 

 elytra pale fuscous, antennae and feet pale rufous. \ lin. long. Hab. Middle States. 

 Head whitish pubescent : prothorax considerably wider than the elytra, pubescent, 

 densely punctate ; posterior angles produced and acute, embracing the elytra : scutel 

 wide, black, punctate, and pubescent: elytra short, pale fuscous, punctate, and 

 sparsely pubescent, gradually narrowing posteriorly; apex of each slightly rounded : 

 pygidium but little exposed. The prothorax nearly resembles that of atomaria 

 Degeer, as figured in Gillmeister's pi. 3, fig. 3, the posterior angles are however more 

 produced, and the entire form is less quadrate. 



T. DISCOLOR HaJd. Oblong, sides subparallel ; black, punctate, pubescent ; elytra 

 pale yellowish fuscous. \ lin. long. Hab. Lake Superior. Head pubescent ; 

 antennse fuscous, base flavous : prothorax pubescent, densely and coarsely punctate ; 

 posterior angles moderately produced in an acute angle ; sides scarcely wider than 

 the elytra, and slightly narrowed towards the base : elytra subparallel, punctate and 

 pubescent, apex faintly rounded : abdomen exposed, pubescent : feet flavous ? The 

 slight convergence of the prothorax and elytra towards the base of the former, 

 produce a lateral outline like that in brevipennis Erichson, Gillm. pi, 4, fig. 1. 



T. ABRUPTA Hald. Shining black, punctate and pubescent, wide, sicj^s subparallel, 

 truncate posteriorly, feet flavous. ^ lin. long, Hab. PennsyTvTTWl. Outline of 

 atomaria Degeer, Gillm. pi. 3, fig. 3, but the prothorax is less contracted anteriorly : 

 head and pronotum thickly punctured and pubescent ; the latter scarcely wider than 



