22 ADEPHAGA. 
and obsoletely punctured, blackish, with a large transverse mark behind the shoulder, 
and another, smaller, longitudinal mark before the apex, yellow; the basal impression 
deep, and quite as long as that on the thorax. Hind coxe with only a few subobsolete 
punctures ; metasternum on each side with more distinct punctures. The front and 
middle tarsi are slender in the specimens before me. 
This is a species very difficult to place, but, on the whole, is probably nearer to 
Hydroporus pictodes, Crotch, than to any other species. 
7. Bidessus fryi. 
Hydroporus fryii, Clk. Ann. & Mag. Nat. Hist. ser. 3, x. p. 181°. 
Hab. Mexico (Trugqui'). 
The description points to a species possibly allied to B. guadrinotatus or B. guadri- 
signatus, but with thoracic impression or plica fine and thread-like. 
8. Bidessus latifrons. 
Ovalis, parum convexus, sine pubescentia, pernitidus, subtiliter punctatus, castaneus, elytris pone basin et ante 
apicem vix discrete testaceo signatis, antennis pedibusque testaceis ; clypeo in medio marginato. 
Long. vix 1, lat. vix 3 lin. 
Hab. Guaremata, San Gerénimo (Champion). 
Antenne rather elongate, slender, clear yellow. Head broad, almost impunctate ; 
clypeus margined in front in the middle. Thorax finely punctate, on each side with a 
fine but distinct and elongate stria. Elytra with the basal portion broadly but 
indefinitely pale, and with a very indistinct pale mark just before the apex, rather 
finely but quite distinctly punctate, the punctuation more obsolete near the base than 
elsewhere. Hind coxe with some moderately coarse punctures; metasternum rather 
more finely punctate. 
I have seen but a single individual ; it has the front tarsi quite slender, and may be 
either male or female. Although very different in appearance, the species appears to 
be undoubtedly allied to B. guadrinotatus. 
9. Bidessus lynceus. 
Bidessus lynceus, Sharp, Trans. Roy. Dubl. Soc. n..s. ii. p. 368. 
Hab. Guatemata, Guatemala city and San Gerénimo (Champion). 
The species should be placed in the 4th group of my memoir, and not in the 5th 
group, where it was (doc. cit.) located by an error. 
10. Bidessus substriatus. 
(@.) Ovalis, latiusculus, fusco-rufus, limbo dilutiore, sine pubescentia, opacus, obsolete punctatus; elytris 
impressione basali sat elongata, stria suturali obsoletissima; coxis posticis punctis paucis magnis 
obsoletis. 
Long. 14, lat. 3 lin. 
