26 G. H. HORN, M. D. ^ 



gradually convergent, moderately convex, surface finely but ratlier deeply 

 striate, striae indistinctly punctate, intervals moderately convex, moderately 

 densely and rather roughly punctate, prosternum in front of coxse obtusely 

 carinate. Body beneath sf>arsely punctate and pubescent and more shining. 

 Length .50 inch; 12.6 mm. 



The males have the last ventral segment slightly oblique at the 

 sides and very feebly truncate at tip. The last ventral of the female 

 •is not oblique and is very slightly prolonged and oval at tip, the dif- 

 ference between the two .sexes in this respect is barely discernible. 



iiy the form of the antennae this species is allied to mohstua. opta- 

 tus and teuui/ormi's; it differs from the first two by the absence of any 

 marginal line, and from the latter by its less slender form and rather 

 deeply striate elytra, and from all by the thorax more coarsely and 

 densely punctured. Its form is nearly that of the male of Con/mbites 

 ct/lhi ilriform is . 



All the species of this genus have the last joint of the antein;c 

 rather suddenly narrowed near the tip, presenting the appearance of 

 the false joint so often seen in Ludius ; in mo/e.^^jts, however, this 

 character is barely perceptible. 



Specimens were collected by Mr. Crotch, at Los Angeles, California. 

 A. speratUS, Lee. — In this species the thorax is distinctly louger than 

 wide, the sides feebly and the hind angles more strongly divergent. The 

 third joint of the antennse is nearly twice as long as the second, and the two 

 together nearly equal to the fourth. The elytra are very feebly striate, the 

 intervals sparsely clothed with short but coarse pubescence which conveigos 

 from each side of the interval to the middle and forms, apparently, lines of 

 pubescence. The tarsi are slender and as long as their respective tibiae. 

 Length .56— .fi2 inch; 14—15.5 mm. 



Occurs at Tejon and Los Angeles, California. 



The sexual characters are the same in this species as in angustirol- 

 lu. The antennae are clothed with short erect hairs. 



A. optalus, Lee— Thorax as long as wide; sides distinctly margined, 

 gradually divergent to base, hind angles slightly more divergent, acutely cari- 

 nate, surface moderately convex, sparsely punctate and shin'ng. Antennae 

 strongly serrate, sparsely hairy, third joint elongate oval, larger than the sec- 

 ond, the two together equal to three-fourths the fourth joint. Elytra feebly 

 striate, striie punctured, intervals sparsely punctate and sparsely pubescent. 

 The under surface is sparsely and finely punctate. The tarsi are sleniier, the 

 anterior four as long, the hind tarsi longer than the tibiae. Length .60 inch. 



The male of this species has the last ventral segment rather deeply 

 sinuate on each side and considerably prolonged at middle, the tip ob- 

 tusely rounded. 



Occurs in the Soulheiii Coast Range and at Tejon, Califoania. 



