ARRHABAUS.—ECHOUERUS. 145 
1. Arrhabeus convexus. (Tab. VII. fig. 6; 6a, labium; 64, maxilla and 
maxillary palpus; 6, antenna. ) 
Oblong ovate, very convex, dark reddish brown or black, shining. Head coarsely and rather closely punctured, 
the front broadly but shallowly depressed (more deeply in the male), the lateral margins raised and swollen ; 
prothorax broader than long, narrowing a little before and behind, the angles obtuse, widest about the 
middle, the base broadly but feebly emarginate, the dise broadly concave in front (more deeply in the 
male), very coarsely and rather closely punctured ; elytra coarsely punctate-striate, the interstices convex 
and finely and sparingly punctured; beneath shining, the prothorax and the sides of the metasternum rather 
coarsely, the latter in the middle and the ventral surface much more sparingly and finely, punctured. ” 
Length 43-5 millim. (¢ 9.) 
Hab. Costa Rica, Irazu, Cache ( Rogers); Panama, Volcan de Chiriqui, Bugaba 
(Champion). 
Many specimens. In well-developed males of this species the lateral margins of the 
front are more raised ; the thorax broader, more strongly transversely convex, and the 
disc more deeply excavate in front. 
A specimen from Irazu is figured. 
GNATHOCERUS. 
_ Gnathocerus, Thunberg, Act. Holm. 1814, p. 47; Lacord. Gen. Col. v. p. 8322; Horn, Rev. Ten. of 
Am. north of Mexico, p. 365. 
This genus is now restricted to a cosmopolitan species found nearly all over the world, 
and the native country of which is apparently unknown. 
1. Gnathocerus cornutus*. 
Trogosita cornuta, Fabr. Ent. Syst. Suppl. p. 51. 
Hab. NortH America.—MeExico, Orizaba, Guanajuato (Sallé), Jalapa (Hoge); Gua- 
TEMALA (Sal/é).—Europe &c. 
An introduced species. 
ECHOCERUS. 
Echocerus, Horn, Rev. Ten. of Am. north of Mexico, p. 366 (1870) ; Lec. & Horn, Class. Col. N. A. 
p. 381. 
This is a genus founded by Dr. Horn upon a single species introduced into the United 
States; it is probably a native of South America, and perhaps also of our country, from 
whence we now add a second species. I have retained Echocerus as distinct from Gna- 
thocerus, but I very much doubt whether it can be maintained, the second species now 
described being in some respects intermediate, though agreeing best with the former. 
* T have not thought it necessary to give full synonymy for this and the other introduced species which do 
not really belong to our fauna. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 1, Aprid 1886. UU 
