80 HYDROPHILIDA. 
quite destitute of this carina. The basal ventral segment is not carinate, except that 
it is prominent between the coxe. 
This species is probably an ally of the Californian B. punctatissimus, Lec. 
2. Berosus truncatipennis. 
Berosus truncatipennis, Cast. Hist. Nat. ii. p. 56°. 
Hab. Mexico, Oaxaca (Hoge), Vera Cruz, Cordova (Sallé); GuatEMALA, Paso Antonio 
400 feet (Champion).—Braziu!, Santa Cruz (van Volxem). 
3. Berosus griseus. 
Angustulus, capite seneo, crebre fortiter punctato ; prothorace valde transverso, fortiter punctato, fusco-testaceo, 
lateribus dilutioribus, dorso parum discrete fusco-bivittato; elytris sat profunde striatis, striis parum 
distincte punctatis, interstitiis fortiter crebreque punctatis, apicibus spinosis, fusco-testaceis, parum 
discrete nigro-maculatis ; corpore subtus fusco-testaceo, capite abdomineque nigricantibus ; pedibus, anten- 
narum basi palpisque pallide testaceis, his apice summo nigro. 
Long. 2, lat. vix 1 lin. 
Hab. GuatTEMALA, Paso Antonio (Champion). 
Head broad, with large convex eyes; its upper surface of shining golden or brassy 
colour, closely punctate. Thorax very coarsely punctate; the two dark marks on the 
middle are but little distinct from the ground-colour, but, viewed in certain lights, 
appear metallic. The elytra are rather deeply striate, the sutural strie not being very 
much finer than the outer ones; the punctuation of the interstices is coarse and rather 
close; at the apex of each is a short acute spine or tooth, only moderately distant from 
the suture; the maculation is but indistinct ; a large black spot near the side about the 
middle, however, is conspicuous ; and there is a humeral spot, also rather indistinct. 
The legs are clear pale yellow ; the front tarsi extremely slender. 
The male has the basal joints of the front tarsi scarcely dilated; the fifth ventral 
segment has on each side of the middle an emargination bounded externally by a 
tooth ; the broad space separating these teeth is quite gently rounded. In the female 
the lateral teeth are not so widely separated, and the space between them is nearly 
truncate, there being, however, a very slight trace of a broad emargination in the 
middle. There is no carination of the basal segment in either sex. 
I do not know any near ally for this insect. The mesosternal lamina is but little 
elevated, but is nevertheless, at its most prominent part, developed so as to form 
there a free projecting angle. 
4, Berosus puncticollis. 
Oblongo-ovalis, capite aureo-zneo, fortiter punctato, nitido; prothorace fortiter transverso, pallide testaceo, 
fortiter punctato, dorso late fusco-bivittato ; elytris testaceis, vix fusco-maculatis, profunde striatis, striis 
punctatis, interstitiis uniseriatim punctatis ; pedibus, antennis palpisque testaceis, his apice fusco. 
Long. 1#, lat. vix 1 lin. 
Hab. Mexico, Oaxaca (Hoge). 
