1878.] 545 [Horn. 
three elongate-oval ; each as long as the eighth, the four (8-11) with short 
erect hair sparsely placed. 
This species is separated from Sinorylon solely on account of the structure 
of the antenne, the eleven joints together with the presence of fowr di- 
lated terminal joints appearing to be too great a divergence from the type 
of that genus to permit its admission there. 
T. Schwar2i, 0. sp. 
Cylindrical, shining, rufous, apex of elytra piceous. Head finely granu- 
lar, front bituberculate (3‘?). Thorax as broad as long, slightly narrowed 
in front, sides feebly arcuate, apex truncate, anteriorly with spiniform 
tubercles, one of which on each side at apical margin is unciform, disc at 
middle finely tuberculate, at base and sides sparsely and finely punctured. 
Elytra irregularly punctate, punctures neither coarse nor dense, declivity 
flattened, margined at tip and above on each side obtusely trituberculate, 
surface densely and coarsely punctured. Body beneath rufous, sparsely 
punctate. Legs and antenne rufous. Length .18 inch ; 4.5 mm. 
One specimen taken by Dr. E. A. Schwarz, at Capron, Florida, another 
from the Island of Santo Domingo from Mr. W. M. Gabb. 
BOSTRICHUS Geoff. 
The essential difference between this genus and Amp/icerus is in the oc- 
currence of a slight frontal margin, which is sometimes evident only at the 
sides over the insertion of the antenne. There is nothing special in the 
facies which can be relied on to assist the discrimination of the two. The 
hind angles of the thorax are always prominent, but there is one Amp/hi- 
cerus in which this also occurs. 
Our species may be known by the differences given in the following 
table. 
Thorax in front with two unciform processes. 
Elytra, bicostate, -vestiture.scale-like.. . «<0. cet oaw om cieiece oes bicornis. 
Elytra with one short basal costa, vestiture hairy.............. armiger, 
Thorax in front simply emarginate or truncate. 
Vestiture of elytra consisting of spots of pubescence irregularly placed. 
ANikorezhe OLIVES HaMTI mon ye AOA e Ee heb nao cen oF truncaticollis. 
Vestiture consisting of very sparsely placed, scarcely observable pubes- 
cence.’ Thorax emarrinate in front, <5... .6.3<2< «3-045 californicus. 
B. bicornis Weber, (Apate) Obs. Ent. p. 91; Say, Journ. Acad. III, 
p- 319; serricollis Germ. Ins. Spec. nov., p. 464. 
Piceous, sub-opaque, surface clothed with yellowish scales aggregated in 
irregular patches. Thorax prolonged in front in two unciform processes 
which are serrate, between them the apex is truncate, apical region roughly 
granulate, posteriorly with smaller granules, median line distinctly im- 
pressed, hind angles prominent, surface sparsely scaly. Elytra bicostate, 
the inner costa stronger, surface densely cribrately punctured and clothed 
with yellowish scales in patches. Body beneath finely scabrous, sparsely 
PROC. AMER. PHILOS. soc. xvir. 101. 3P. PRINTED JUNE 1, 1878. 
