LeConte. 



CEUTORHYNCHINI. 281 



1. P. velatus Gyll., Scli. Cure, iii, 459; Ehpnchienus vel. Beck, Beitr. 

 Bayersch. Ins. Fauna, 20 ; Liiodactylus vel. Redt., Faun. Austr. 777 ; 

 Eubrychius vel. Thomson, Skand. Col. vii, 232. 



A specimen collected at Detroit, Michigan, by Messrs. Hubbard and 

 Schwarz, does not differ appreciably from the detailed descriptions above 

 cited ; it is rare in northern and middle Europe, on Potamageton and other 

 plants, below the surface of the water. It is a small black insect, clothed 

 with depressed greenish yellow scales ; the prothorax has two broad dark 

 stripes ; the elytra are more thinly clothed with scales, except the sutural 

 interspace, which is densely covered. The antennae and legs are bright 

 yellow, with the knees dusky. Length 2 mm. ; .08 inch. 



PELENOMUS Thomson. 



Tlie species of this genus are easily distinguished by the short stout beak, 

 whicli they have in common with Rhinoncus and Ccelogaster, being com- 

 bined with prosternum somewhat emarginate in front, but without ante- 

 coxal ridges. Tlie eyes are round, convex, without orbital ridges, and 

 are completely exposed in repose, on account of the entire absence of the 

 postocular lobes of the prothorax. The claws are simple and moderately 

 large. The funicle is 6-jointed, with the tirst joint longer and stouter ; the 

 club is rather large, oval-pointed, annulated and acuminate. There are 

 but three species in my collection : 



A. Funicle slender, 2d and 3d joints distinctly longer. 

 Prothorax broadly sulcate, apical and posterior 



tubercles strongly marked, acute 1. sulcicollis. 



B. Funicle shorter and stouter, joints 2-3 very little longer. 

 Prothorax broadly sulcate, apical tubercles more dis- 

 tant but acute, posterior tubercles acute 2. squamosus. 



Apical tubercles indistinct ; interspaces of elytra 

 with rows of acute tubercles 3. cavifrons. 



1. P. sulcicollis. PhytoMus sulc. Fahr., Sch. Cure, vii, 346. 



Lake Superior to Georgia. The second and third joints of the funicle 

 are distinctly longer than the following ones, and the upper margin of the 

 eye is a little prominent, showing a tendency toward the second division of 

 Ccelogaster. 



2. P. squamosus, n. sp. 



Smaller than P. sulcicollis, black, above densely clothed with dark gray 

 scales, slightly mottled with brown, beneath with paler scales. Beak 

 scarcely longer than the head, stout, cylindrical, densely and finely punc- 

 tured ; eyes convex, prominent, head densely punctured, not impressed. 

 Prothorax wider than long, much narrowed in front, apical tubercles acute, 

 distant, posterior tubercles acute, rather large ; dorsal channel not deep, 

 sides and dorsal stripe with paler scales. Elytra with deep slightly punc- 

 tured striae, interspaces convex, very finely rugose. Antennae and legs 

 more or less testaceous ; the former rather stout, with large oval club; 



PHOC. AMER. PHILOS. SOC. XV. 96. 2j 



