AMERICAN COLEOPTERA. 293 



Abundant on the sea coast near San Francisco, California. 



This species was placed in ^Efjialia, by Leconte, but the mandibles 

 are entirely concealed beneath the clypeus. It may readily be known 

 from all our species by its strongly inflated elytra. The body is apterous- 



Ps. bidens, n. sp. — Oblong oval, piceous moderately shining. Head verru. 

 cose, clyiiciis emarginate and on each side with an acute vertical tooth 

 Tiiorax one half broader than long, sides moderately rounded, surface nearly 

 smooth and with very few moderate punctures near the base and a short trans- 

 verse imj)ression at the anterior angle punctured at bottom. Elytra striate, 

 strire punctured intervals very feebly convex and smooth. Abdomen with few 

 punctures; legS brownish : ti hire stout. Jjength .14 inch ; 3.5 mm. 



This species is abundantly distiuouished by the bidentate clypeus 

 and the total obliteratitjn of the transverse ridges of the thorax, the 

 only trace of this stul}»ture remaining is the very short groove near 

 the anterior angles. 



Two specimens from the Southern States, probably Georgia. 



Aphodius clypeatuA, Say, Long's Exped. II, p. 277. — Which is at present un- 

 known to us appears to belong rather to the present genus than JEgmlia, 



.EGIALIA, Latr. 

 Our species are but four and may be distinguished in the following 

 manner. 



Spurs of hind tibiae slender acute at tip. 



Intervals of elytra punctured cylindrica. 



Intervals smooth, im punctured lacustris. 



Spurs of hind tibiae (inner especially) thin and very broad couferta. 



S])urs of hind tibiae obtuse, but not explanatb crassa. 



S,. cylindrica, Esch. {Psummodms) Entomog. I, p. 11 ; Maun. (O-rj/owit*) Bull. 

 Mosc. 1843, II, p. 262; id, (^jjialia) IS.iS, III, p. 220.— Piceous black, moder- 

 ately shining, oblong. Head very coarsely and sub-confluently punctured, 

 clypeus very broadly emarginate. Thorax broader than long, slightly broader 

 behind, sides moderately rounded margins crenulate ; surface coarsely but re- 

 gularly jiunctured and with a slight median impression behind. Elytra oblong, 

 str'ate, strife punctured, intervals feebly convex biseriately punctulate. Lcs 

 piceo-rufous, hind tibiae moderately stout termiuated by slender spurs. Length 

 .20 inch ; 5 mm. 



Typical specimens are before me from Mannerheim, collected in 

 Alaska. It may be known from all our species by the punctulate ely- 

 tral intervals and rather strongly crenulate margin of thorax. 



S.. lacustris, Lee. Agass. Lake Superior, p. 225. — Oblong, black, moderate! v 

 shining. Head coarsely punctured at vortex, verrucose in front; clvpeus 

 emarginate. Thorax one third broader than long, sides moderately rounded 

 surface coarsely punctured, mbre sparsely in front and with a shallow broad 

 iin{)re.ssion near each anterior angle. Elytra oblong, oval, somewhat broader 

 behind, surface deejily striate, striae f)unctured, intervals convex, smooth. 



Hind tibiae rather slender, with slender sj)urs. Length .18^.22 inch; 4.5 6.5 



ram. 



TItA.NS. AMKll. ENT. SOC. (38) JU.NK, 1S71. 



