ORTHOSTETHUS. 509 



2. OrthostethllS piceus. (Tab. XXII. figg. 13, ? ; 13 a, genitalia.) 

 Orthostethus piceus, Cand. Monogr. Elat. iv. p. 315, t. 4. figg. 10,, 10a, b\ 



Hob. Mexico, Cordova {Salle l ) ; Beitish Honduras (coll. Janson) ; Guatemala, 

 Capetillo (Champion); Panama, Bugaba, Volcan de Chiriqui (Champion). 



I have seen eleven examples of this species, five of which are from Chiriqui, including 

 both sexes. The males have the thorax rapidly narrowing from the base, the sides 

 being rounded in the females. The shorter and less parallel thorax distinguishes it 

 from either sex of 0. infuscatus ; the elytra are less acuminate than in that species, 

 this being especially noticeable in the females. A specimen from Chiriqui is figured. 



3. Orthostethus COrvinilS. (Tab. XXII. figg. 12, S; 12 a, genitalia.) 



Aphanobius corvinus, Germ. Zeitschr. fur Ent. v. p. 183 l . 



Orthostethus corvinus, Lacord. Gen. iv. p. 207, nota 2 ; Cand. Monogr. iv. p. 316 3 ; Steinh. Col. 

 Hefte, xiv. p. 133 4 . 



Hab. Mexico (Salle) ; Guatemala (coll. Janson), Santa Cruz and San Geronimo in 

 Vera Paz, Totonicapam 10,000 feet, Quiche Mts. 7000 to 9000 feet, Cerro Zunil 

 (Champion), Tecpan (Conradt); Nicaeagua, Chontales (Belt, E. M. Janson); Costa 

 Rica (coll. Janson). — Colombia 1-4 . 



Not uncommon in the mountainous districts of Central America, all the specimens 

 captured by myself having been found at elevations of 4000 feet and upwards. 

 Germar's type is a female (not a male, as Candeze supposed) ; the males are very 

 much smaller, and they have the thorax much less rounded at the sides and rapidly 

 converging from the base, and the antennas more elongate. O. corvinus may be easily 

 distinguished from its allies by its deep black colour and the very sparse, fine, blackish 

 pubescence. The specimens before me vary from 18-35 millim. in length, and from 

 5-9 millim. in breadth. An example from Cerro Zunil is figured. 



4. Orthostethus glabratus. (Tab. XXII. fig. 15, $ .) 



Elongate, broad, flattened above, very shining, deep black, almost glabrous, the head, the apex of the elytra, 

 and the under surface with a few very fine, short, blackish hairs. Head moderately convex, sparsely, 

 finely punctate ; antennae short, not nearly reaching the hind angles of the prothorax, the joints from the 

 fourth dilated and strongly serrate, 3 as long as 4. Prothorax as long as broad, gradually narrowing 

 from the base forwards, the sides rounded in front and feebly sinuate towards the base and apex ; the 

 hind angles long, stout, and divergent, slightly incurved at the tip, strongly carinate ; the surface with 

 widely scattered fine punctures, which become very minute on the basal half of the disc, a small space 

 down the middle behind impunctate. Elytra three times the length of the prothorax, rapidly narrowing 

 from a little below the base, the base broadly depressed near the shoulders, the apices slightly dehiscent, 

 the sutural angles mucronate ; sparsely, minutely punctate, without trace of stria?. Beneath very sparsely 

 punctate, the punctures coarse on the prosternum, those on the other parts excessively fine ; prosternal 

 process very long and stout ; mesosternum with the sides of the cavity much thickened and greatly raised, 



