BEROSUS. 81 
Head coarsely punctate, with a depression on the middle. Thorax very strongly 
transverse, with the sides straight, shining, but with the surface coarsely and deeply 
punctate; the two approximate discoidal vitte rather indefinite. Elytra rather deeply 
striate ; the striz very distinctly punctured, the punctures being more separate from 
one another than usual; the interstices shining, each bearing an almost regular series 
of fine punctures. Legs unicolorous, clear yellow. Antenne entirely yellow; palpi 
with the extremity rather largely infuscate. 
A distinct species, with the apices of the elytra unarmed ; the mesosternal lamina 
forming in front a short but quite distinct falcate projection ; the anterior part of the 
under surface of the head very polished and shining, the mentum being entirely without 
punctures; the basal ventral segment has a fine, sharply elevated carina between the 
cox; but this does not extend backwards. ‘The unique individual before me is a 
female, and possesses on the fifth ventral segment a transverse emargination, the base of 
which appears to me to form a very short rounded projection, without teeth. 
5. Berosus infuscatus. 
Berosus infuscatus, Lec. Proc. Ac. Phil. 1855, p. 365°; Horn, Trans. Am. Phil. Soc. xu. p. 123”. 
Hab. Nortu America, Southern States from Florida to California ! 2,—Mzextco, Oaxaca 
(Hoge), Parada (Sal/é). 
The series of more than twenty individuals found by Hoge shows very little variation 
independent of the sexual differences. The two teeth, alluded to by Dr. Horn, at the base 
of the emargination of the fifth ventral segment in the male are not easily detected, 
owing to their being nearly covered by a lobing or production of the base of the 
emargination; this lobe, moreover, is finely ciliate. I have not seen any North- 
American individual of the species; and as the allied species in this group are 
extremely similar to one another (although distinguished by valid characters), my 
determination of these Mexican individuals may possibly prove incorrect. 
6. Berosus falcatus. 
Flavo-griseus, capite aureo, prothorace medio vittis duabus parvulis fusco-eneis ; elytris parum discrete fusco 
maculatis ; antennis, palpis pedibusque testaceis ; prothorace sat crebre punctato; lamina mesosternali 
anterius longius dependente, quasi in spinam tenuem producta; elytrorum apicibus muticis. 
Mas prothorace elytrisque nitidis. 
Fem. prothorace elytrisque opacis alutaceis. 
Long. 3-33, lat. 13 lin. 
Hab. Muxico, Guanajuato (Dugés, coll. Sallé), Toluca (Sallé). 
This species is remarkable by the great sexual disparity in the sculpture of the 
thorax and elytra, and by the elongate mesosternal lamina, which in front is produced 
to form a slender elongate falcate process; the punctuation of the thorax is less 
regular than in the allied species, there being on the disk a denser, rougher sculpture, 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, December 1882. MM 
