20 . ADEPHAGA. 
punctate. Elytra yellow, but blackish about the suture, the black colour extending 
laterally so as to form a very irregular marking occupying about half the area; the 
punctuation is coarse and very distinct, but becomes quite obsolete before the sides are 
' reached; the punctures do not, however, reach the suture, but a narrow impunctate 
space is left there, and thus some appearance of a sutural stria is given; the basal 
impression or plica is very distinct, and is about as long as the length of the thorax 
along the middle. The under surface is shining, and the impression behind the middle 
coxal cavity deep; across the hind coxa there is a patch of coarse punctuation; and 
there are also two series of coarse punctures on the first abdominal segment. 
This peculiar little species I obtained from the collection of the late Mr. Aspinal 
Turner, of Manchester. I cannot indicate any near ally for it; it has the breast more 
elongate than the Hydroporus pictodes allies, and perhaps on the whole had better be 
placed for a while in group 1 (Sharp) of the genus. 
2. Bidessus hydrovatoides. (Tab. I. fig. 5.) 
Brevior, ovalis, convexus, postice acuminatus, sine pubescentia, testaceo-ferrugineus; prothorace obsolete 
punctulato, basi utrinque striola subtili; elytris crebre subtiliter, coxis posticis sparsim subobsolete 
punctatis. 
Long. 2, lat. vix 3 lin. 
Hab. Guaremaa, Paso Antonio, 400 feet (Champion). 
This is one of the peculiar species forming group 2 of my memoir. It is closely 
allied to Hydroporus apicatus, but is smaller, and the posterior portion of the body 
much less elongate. As in the other species of the group, the third, fourth, and fifth 
joints of the antenne are considerably smaller than the others, the third being quite 
small, though perceptibly larger than the fourth; the sixth to the tenth joints are 
slightly serrate internally ; and the terminal joint is acuminate with oblique apex. The 
resemblance in the form of the head and antenne to the species forming the genus 
Hydrovatus is considerable. I am not able to detect any external sexual characters. 
3. Bidessus apicatus. 
Hydroporus apicatus, Clk. Ann. & Mag. Nat. Hist. ser. 3, x. p. 184°; Sharp, Trans. Roy. Dubl. Soc, 
n. 8. u. p. 346°. 
Hab. Mexico, Teapa!.—San Domineo?. 
Although Clark’s description is very short, I do not think his species will prove to 
be the same as that I have just described as B. hydrovatoides, although no doubt it is 
closely allied thereto. 
4, Bidessus germanus. (‘lab. I. fig. 6.) 
Brevis, latiusculus, sine pubescentia, rufo-testaceus, elytris fusco-umbrosis; prothorace brevi, fere impunctato, 
