530 RHYNCHOPHORA. 
beneath ; tibia unguiculate at the inner apical angle in the J, unarmed in the 9, the intermediate and 
posterior pairs widened at the apex externally, the anterior pair bowed inwards ; tarsal claws subconnate 
at the base; body rhomboid-ovate, sparsely squamose. 
This genus is based upon a single species found on Zanthoaylon * (=Xanthoxylum) 
in Louisiana, and occurring also in Texas. The one now added is closely related to 
the type, A. sudulirostris, Casey (=Z. schwarzi, Pierce), but has the rostrum dis- 
similarly formed in the two sexes. Amercedes is readily distinguishable by the 
structure of the prosternum, rostrum, and antenne. The form of the mandibles, as 
described by Casey, can only be seen when they are fully opened. 
1. Amercedes orthorrhinus, sp. n. (Tab. XVII. figg. 12, 12a, 3; 13, 2.) 
Rather convex, black ; clothed above with a few small, hair-like, intermixed dark brown and whitish scales, 
which are arranged in a single row down each elytral interstice, the vestiture of the under surface and 
legs closer and wholly whitish. Head closely punctate ; rostrum (¢) a little longer than the head and 
prothorax, finely striato-punctate, (2 ) more elongate, with the tumid basal portion rugosely punctate 
at the sides and the slender straight apical portion almost smooth. Prothorax transverse, somewhat 
convex, constricted and much narrowed in front, the sides arcuately converging from the base; coarsely, 
closely punctate, sometimes with a smooth median line. Scutellum subtriangular. Elytra at the 
shoulders considerably wider than the prothorax, depressed along the suture; deeply punctate-striate, 
the interstices. roughly uniseriate-punctate. Beneath closely punctate; first ventral segment slightly 
depressed down the middle in the ¢. 
Length 35-34, breadth 1?-1,%, millim. (¢ @.) 
Hab. GUATEMALA, Duefias (Champion). 
One male and three females. 
ZY GOBARIS. 
Zygobaris, Leconte, Proc. Am. Phil. Soc. xv. p. 317 (1876) (part.) ; Casey, Ann. N. York Acad. 
Sci. vi. pp. 469, 663; Pierce, Ent. News, 1907, p. 882. 
This genus includes two species from North America, and a third is now added 
from our region. They have a very long rostrum (at least in the female), separated 
from the head by a transverse sulcus; the prosternum unarmed, the median depression 
narrowing forwards, terminating in a fovea in the subapical groove, and limited on 
each side by an oblique ridge; the tarsal claws connate at the base; the upper surface 
of the body coarsely punctate and sparsely squamose. The type is Z. nitens, Lec., 
from Florida; the other species, Z. xanthoayli, Pierce, has been bred from Zanthoxylon 
(Xanthoaylum) berries in Texas f. 
1. Zygobaris tristicula, sp.n. (Tab. XVII. figg. 14, 14a, 3.) 
Rhomboidal, rather convex, shining, black ; the upper surface with a few scattered, hair-like, decumbent, 
white scales, those on the elytra arranged in an incomplete series along the alternate interstices; the 
* Biol. Centr.-Am., Botany, i. p. 168. 
+ An unnamed Zygobarid from Cameron Co., Texas, sent me by Mr. Wickham, appears to be referable to 
this species. Z, nitens I have not seen. 
