30 ADEPHAGA. 
punctis numerosis subseriatis, externis seriebus obsoletis ; corpore subtus opaco, coxis posticis abdomineque 
basi rugis profundis. 
B41: 
Long. 2, lat. 1,5, lin. 
Hab. GUATEMALA, Quiche Mountains, 7000-9000 feet (Champion). 
This species is closely allied to H. mexicanus, but readily distinguished by the 
numerous punctures interspersed between the sutural and discoidal series on the wing- 
cases; besides this, the sculpture throughout is finer, and the size less. It is also 
extremely similar to the entirely black varieties of H. decemsignatus; but it has a 
broader head and is less acuminate behind, and is also readily distinguished from it by 
the additional punctures on the wing-cases: these additional punctures assume a 
_ subseriate form, and thus the true series are not readily recognized; but they exist 
as in the other allied species. 
T do not know the sex of the unique individual found by Mr. Champion. 
8. Hydroporus bifidus. 
Hydroporus bifidus, Say, Trans. Am. Phil. Soc. iv. p. 444’; Sharp, Trans. Roy. Dubl. Soc. n.s. 11. 
p. 789. 
Hab. Mexico, Vera Cruz}. 
The descriptions apparently indicate an insect similar to H. equinoctialis, Clk. 
9. Hydroporus nudatus. 
Hydroporus nudatus, Say, Trans. Am. Phil. Soc. iv. p. 444°; Sharp, Trans. Roy. Dubl. Soc. n.s. ii. 
p- 808. 
Hab. Mexico, Vera Cruz}. 
This is apparently also similar to H. equinoctialis, and may probably, indeed, prove 
to be the same. 
10. Hydroporus sericatus. 
Hydroporus sericatus, Say, Trans. Am. Phil. Soc. iv. p. 445'; Sharp, Trans. Roy. Dubl. Soc. n. s. 
ii. p. 810. 
Hab. Mexico, Vera Cruz}. 
This is stated by its describer to be near to H. undulatus, Say. 
11. Hydroporus kingi. 
Hydroporus kingii, Clk. Ann. & Mag. Nat. Hist. ser. 3, x. p. 178’; Sharp, Trans. Roy. Dubl. Soc. 
n.s. li. p. 799. 
Hab. Mexico (Truqui 1). 
A specimen of this species in our national collection at the British Museum indi- 
cates that this is a species allied to the Californian H. vilis, Lec. 
