COPELATUS.—COPTOTOMUS. 4] 
the first is a little abbreviate at the base. The male has the front and middle tarsi 
moderately dilated; and the anterior tibie are a little curved below the knee and 
notched on the inner margin. The female is quite without sexual sculpture. 
The species may be placed next to C. glyphicus, Say, to which, however, it is by no 
means closely allied; it is considerably smaller and different in colour ; and the strize 
are finer and not quite so prolonged at the apex. It very much resembles C. celati- 
pennis, but is smaller, of more parallel form, and has the elytra more finely striated, 
and the thorax without the numerous minute impressions or elongate punctures 
found in that species. 
21. Copelatus czelatipennis. 
Copelatus celatipennis, Aubé, Spec. Gén. vi. p. 382*; Sharp, Trans. Roy. Dubl. Soc. n.s. ii. p. 591. 
Hab. British Honpuras, Rio Hondo (Blancaneaux).—Soutn America, Santa Rita 
and Espirito Santo; AwrTiLuss !. 
This species is only recorded as Central American on the authority of a single female 
from Honduras; this specimen is rather smaller, and has the sculpture on the thorax 
and wing-cases rather finer than the individuals from Brazil. 
COPTOTOMUS. 
Coptotomus, Say, Tr. Am. Phil. Soc. iv. p. 443 (1834) ; Aubé, Spec. Gen. vi. p. 392; Sharp, Trans. 
Roy. Dubl. Soc. n.s. ii. p. 896. 
This is a North-American genus of two or three species, closely allied inter se. 
1. Coptotomus interrogatus. 
Dytiscus interrogatus, Fab. Syst. El. i. p. 367; Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 601. 
Coptotomus interrogatus, Aubé, Spec. Gén. vi. p. 393. 
Hab. Norta America, as far north as Massachusetts.—MeExico, Guanajuato (Duges, 
coll. Sallé). 
A single female from Sallé’s collection is the only evidence of the intrusion of this 
North-American species into Mexico. 
2. Coptotomus serripalpus. 
Coptotomus serripalpus, Say, Tr. Am. Phil. Soc. iv. p. 443°; Sharp, Trans. Roy. Dubl. Soc. n. s. 
ii. p. 770. 
Hab. Mexico}. 
Nothing is known about this species except the description above referred to; and 
it is uncertain whether it will prove to be distinct or only founded on a discoloured 
example of C. interrogatus or one of the other species. 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, April 1882. GG 
