MEMBRA CIDJE. 
69 
spinous; suprahumeral processes of variable lengths; dorsum with two or else three 
tubercles, blunt at their summits, and unequal in size. The known species of the 
genus hitherto described are all inhabitants of America. 
Fairmaire divides the genus into three sections : 
A. Cornes humerales, tr6s saillantes. 
B. Cornes tr6s courtes ou rudimentaires. 
C. Prothorax renfle au-dessus de la tete. 
Walker notes twenty-three species represented in the British Museum Collection. 
Stal divides the group into four genera, viz.: 1. Notocera; 2. Pterygia; 3. Hypso- 
prora; 4. TBchmophora : which last probably is the same as Philya, and should be 
separated from Pterygia of Fairmaire. 
Canon Fowler adds and describes P. bituberculata and P. cerviceps as new species, 
p. 24. 
It may be noted that Pterygia may or may not have humeral processes, but 
the encephalon always has two suprahumeral horns which may be either branched, 
cleft, clavate or truncate. 
The tendency to develop budding horns below the suprahumeral processes is well 
shown in Pterygia. The angular prominences which might be called the humeral 
points are markedly seen in P. cerviceps and in P. arietina. The suprahumerals in 
reality belong more to the characters of the encephalon, which will be better seen in 
the later genera Cyphonia and Bocydium. 
PTERYGIA ARIETINA, Fairm. 
(Plate XI. fig. 1.) 
Germar, Oxyrhacbis Rev. Silb. III. p. 308 ; Eairm. P. arietina, l.c. p. 2G3. 
Pronotum with two short truncated suprahumeral processes ; metopidium per¬ 
pendicular, rough, with minute spines; dorsum spinous, with a single conical 
protuberance ; tibiae spatulate, but not broadly so; hind tibiae fimbriated ; colour 
sooty-black, with white fur-like patches powdered with black dots ; tegmina warm 
reddish-brown, likewise flecked with white; abdomen large. 
Size 5x4 mm. 
From the B.M. Coll. 
Habitat. —Rio Janeiro, Brazil. 
PTERYGIA CERVICEPS, Fowler. 
(Plate XI. fig. 2.) 
Fowler l.c. Tab. II. figs. 12, 12a, p. 21. 
General colour sordid brown, sparsely patched with white pilose matter, with 
interspersed dots; suprahumeral processes longer than those shown in the insect 
