MEMBRA CIDJE. 
84 
more or less recurved horn ; which is in some males clavate or truncate at the tip ; 
supra-humeral processes obvious, but less acute and shorter than in Triquetra; the 
sides not so tectiform; tegmina with three (Fowler says four) apical areas. 
The characters of this and the next genus are mixed and difficult to diagnose. 
The wing-venation is obscure. The pronotal appendages appear to be more acute in 
some species than in others, and some male insects have the procephalon so modified 
that Amyot and Serville, Walker, and Griffini, have described them under the genus 
Physoplia. 
Fairmaire practically divides Umbonia into three sections : 
1. Horn compressed perpendicularly. U. gladius, U. turrit a. 
2. Horn turned backwards, almost horizontally. U. reclinata. 
3. Horn not compressed, almost straight. U. spinosa, U. orizimbo, U. pyramidalis, 
U. amazili, U. signoreti, U. ataliba. 
UMBONIA NIGRATA, Amyot. 
(Plate XVI. fig. 1.) 
Physoplia nigrata, Am. et Serv. l.c. p. 543 (1843). Fairm. l.c. p. 275, plate vi. fig. 6. Umbonia 
orozimbo, 3. 
Small; general colour dark brown, almost black, with a buff punctured triangular 
patch rising from the lower margin of the pronotum and continued to the carina at 
the side of the pronotal process; this horn is knobbed and reflected backwards. 
Another buff patch is seen nearer the posterior end; tegmina black with shining 
radial nervures; legs slender and brownish; abdomen ringed with ferruginous. 
This specimen from the Fowler Collection is a male, and it is drawn as the 
reputed male of TJ. orozimbo, and under the same amplification as U. crassicornis, 
which also is a male. 
N.B.—The red streak is here wanting, though usually present as noted by Fairmaire. 
Size without the horn, 13x5 mm. 
Habitat. —Mexico, Brazil. 
UMBONIA CRASSICORNIS, Am. et Serv. 
(Plate XVI. fig. 2.) 
Amyot, l.c. p. 543, t. 10. Fairm. l.c. p. 275, male of U. orozimbo. Physoplia crassicornis, Amy. 
and Ser. Umbonia orozimbo, Fowl. 
Fowler considers this insect and that named by Amyot U. nigrata are simply 
variable forms of the males of U. orozimbo ; and certainly if the forms of the pronota 
be ignored, it will be difficult to avoid this conclusion, which has been arrived at, he 
says, bjr the comparison of more than 400 specimens. A rule may be proved, it is 
said, by its exceptions, and this insect would appear to exampled by it. The form of 
