COLEOPTEKA. 83 



see hut eiirlil joints in this species ; in Say's linpnfiis, however, there 

 are nine distinct joints, the fourth above described l)ein.ir divided. 



The exposed surface of tlie cardo of tlie maxilhi is variously 

 sculptured in the different species of lielophorus, being in some 

 ornamented with oblique grooves, giving it the a[)pearance of a flat- 

 threaded screw, in others confusedly channeled, and in others punctate. 



PHILHYDRUS Sol. 



P. angustllllis n. sp. — Form elongate, elliptical, very convex, much 

 more than twice as long as wide ; upper surface pale brownish-flavate 

 throughout; under surface dark piceous ; tibiae and tarsi alone paler and 

 similar in color to the upper surface ; palpi and antennae slightly paler, club 

 of the latter piceous-black ; upper surface polished and glabrous. Head 

 one-half wider than long, rather convex ; anterioi- margin broadly rounded, 

 abruptly more strongly so at the sides ; epistomal suture broadly angulate, 

 sides straight, situated almost at the posterior third of the dorsal surface ; 

 from the angle along the occiput to the base there is a very feeble narrow 

 line ; surface rather finely, closely, evenly, and somewhat strongly punctate ; 

 antennae about as long as the head, basal joint as long as the next two 

 together, narrowed toward base, rather slender, second as wide at base as 

 the first, conical, narrowed toward tip, third as long as the fourth and fifth 

 together, the latter transverse, sixth more than twice as wide as long, trape- 

 zoidal, sides very strongly convergent toward the base, the outer side much 

 more strongly so, and the outer angle further from the antennal axis than 

 the inner, club nearly as long as the eutire remainder of tlie antenna, loose, 

 joints of equal width, first two trapezoidal, eleventh as long as the preceding 

 two together, strongly flattened, elongate, oval at tip ; maxillary palpi 

 about one-half longer than the antennae, very slender, third joint very 

 slightly shorter than the second, fourth about two-tliirds as long as the 

 third. Prothorax widest at the base, where it is slightly more than twice as 

 wide as long ; sides rather feebly arcuate ; apex broadly emarginate, about 

 two-thirds as long as the base, which is nearly transverse ; basal angles 

 broadly rounded, apical rather acutely so ; disk finely, closely, and strongly 

 punctate. Elytra at base as wide as the pronotum ; humeral angles rounded ; 

 sides parallel for about two-thirds the length, and feebly arcuate ; disk 

 rather acutely rounded behind, obtuse at the immediate apex, very convex, 

 about three-fifths longer than wide, very slightly more than twice as long as 

 the head and prothorax together, moderately finely, closely, very deeply, 

 and evenly punctate ; sutural striae distinct and feebly arcuate in the poste- 

 rior two-tliirds, completely obsolete in the anterior third. Scutellura longer 

 than wide, sides straight, acutely rounded at tip, finely and closely punc- 

 tate. Abdomen nearly fiat, sunken far within the elytra at the sides, finely 

 and distinctly ruguloso-granulate, and finely and somewhat densely pubes- 

 cent. Legs slender; terminal spurs of the posterior tibiae extremely un- 

 equal. Mesosternnm very feebly carinate, except abruptly near the posterior 

 extremity, where it rises almost as a thick acuminate erect tooth or tubercu- 



