222 NATURAL History BULLETIN. 
ArRTICERUS, Dahiman (ap7, short, «épaz, horn). 
Antennal fover not reaching the eye, head wider, 
last antennal joint with lateral outlines arcuate. 
Length, 1.5 mm. - : - californicus. 
Antennal fovee reaching the eye, head narrower, 
last antennal joint with lateral outlines straight. 
Length, 1.66 mm. - - - = AF UCHSUL 
A. Fucus, Brend. (fustiger, Lec.) Dark yellow, trans- 
lucent, pubescence setiform, in regular rows. Length, 1.66 
mm. Plate VI., Fig. 6. 
ffead much variolate, flattened above, sides subangular near 
the eyes, which’ are situated about one-third of the length 
from the base. Frontal margin and base nearly equal in 
width to each other and to three-fourths of the length of the 
head; frontal margin slightly impressed at middle, frontal sep- 
tum narrow, antennal cavities very large. On the occiput are 
seen two small, shining points (also present in the European 
species), which have the appearance of ocelli. The eyes 
have eight facets. Antenne with the basal joint small, quad- 
rate, root-pulp partly exserted, second joint straight, tuba- 
shaped, tip truncate and three times wider than the base. 
Prothorax variolate, equal to the head in length, as long as 
wide, subglobular, truncate at base and apex, with a deep, 
median, sub-basal, variolate scar. /ytra at the base as wide 
as the prothorax; no humeral tubercles, suture not longer 
than the head, width across the tips equal to one and three- 
fourths times the length of the suture. Posterior limit of each 
elytron angularly lobed near the lateral limit, and having a 
tuft of hair; disk slightly depressed along the suture, with 
sutural lines and about six rows of recumbent sete. Poster- 
iorly the elytra are declivous to the deep, transverse abdom- 
inal fovea. Abdomen wider than the elytra, the basal segment 
longer than wide, deeply transversely foveate, evenly convex 
posteriorly, lateral margin convolute near the base, where it is 
widest and retuse, gradually narrowing behind. First ventral 
transversely impressed on either side. Legs prismatic, the 
