760 SUPPLEMENT. 
there is a slight depression of the surface, and this depression has a dull lustre and is 
obscurely strigose. The epipleure are rather broad near their termination; there is 
no trace of a second claw on the hind foot; and the outer posterior part of the hind 
coxa is densely strigose. 
ENHYDRUS (p. 48). 
Enhydrus atratus (p. 48). 
To the locality Panama, add :—Bugaba (Champion). 
Mr. Champion captured a large number of specimens of this insect in the low forest- 
region at Bugaba. 
GYRINUS (p. 50). 
Gyrinus turbinator (p. 50). 
To the Mexican locality given, add :—Llanos de Salazar 10,000 feet (Hége). 
I have not yet seen a male from Mexico, and am not sure that this insect will prove 
to be really G. turbinator; the female has decidedly a more conspicuous sexual 
sculpture than the Guatemalan type. 
Gyrinus obtusus (p. 50). 
Dr. Regimbart considers that Say’s description of G. obtusus does not refer to the 
insect to which I applied it, and treats Say’s species as one unknown to us. 
As this author’s work is now the standard authority on the Gyrinide, I accept his 
nomenclature. The localities Parada and Puebla (Sal/é) have therefore to be transferred 
to the following species. 
2 (a). Gyrinus plicatus. 
Gyrinus plicatus, Regimb. Ann. Soc. Ent. Fr. 1883, p. 183. 
Gyrinus obtusus, huj. op. p. 50 (nec Say). 
2(s). Gyrinus dimorphus. 
Gyrinus dimorphus, Regimb. Ann. Soc. Ent. Fr. 1883, p. 474', and 1886, p. 2557. 
Mexico, Ciudad in Durango!?, Ventanas (Forrer), Llanos de Salazar 10,000 feet 
(Flohr, Hoge). 
I am not at all sure that I have correctly identified Regimbart’s species; if I have, 
G. dimorphus is very closely allied to G. plicatus, but has no convexity of the alternate 
interstices of the elytra, and has the depression close to the side margin just in front 
of the outer angle of the wing-case not so deep and conspicuous. The Mexican Gyrini 
are, however, very difficult, and it is necessary to have the sexes taken together before 
satisfactory conclusions can be formed. 
