68 
SECOND YARKAND MISSION. 
the preceding : scutellum larger : elytra not depressed behind the scutellum ; the first costa 
not distinctly continued along the base to the scutellum; the intervals from near the base 
clothed with a cinereous pubescence: prosternal process relatively broader, sparsely granulose. 
Length 5j lines ; width of elytra across the middle 3^ lines. 
Kogyar. 
Pterocoma convexa. 
More narrowly ovate, and more convex, than the preceding ; black, a little nitid ; thinly 
clothed with fine cinereous pubescence and setose ; legs tomentose, finely setose, and pilose : 
lahrum entire in front : head and prothorax at bottom very finely, densely, and rugulosely 
punctulate, and with scattered small setiferous tubercles, which are largest on the sides of the 
latter; apex of prothorax truncated; the base sinuate : elytra not depressed behind the scutel- 
lum ; base a little emarginate at each side, rapidly declivous behind ; the intervals with scat- 
tered minute punctures mixed with very small setiferous tubercles ; the first costa strongly 
continued along the base to the scutellum : underside more densely tomentose and studded with 
small setiferous tubercles : prosternal process not quite so strongly produced, and more pointed 
behind than in the preceding, and rugosely tuberculate. 
Length 5 lines ; width of elytra across the middle, 3 lines. 
No locality given. 
Pterocoma semicarinata. 
Very broadly ovate, the elytra being almost rotundate ; black, slightly shining : lahrum 
emarginate in front, the angles very broadly rounded : head with a few rather large, shallow, 
scattered punctures, most perceptible on the epistoma, and with some small setiferous tubercles 
clustered above the eyes ; and others, still smaller, flattened, and not setiferous, on the crown : 
prothorax slightly sinuate in front, the angles acute and prominent ; the sides studded with 
setiferous tubercles, the disc having a few flattened tubercles which are distinctly umbilicate : 
each elytron with a single costa placed half-way between the suture and the shoulder, 
and extending hut little beyond the half the length of the elytron; this costa is furnished with 
tubercles which are a little flattened at top, clustered two or throe together at the base 
they gradually thin out into single ones, and become smaller, behind; it is also strongly con- 
tinued along the base to the scutellum, the tubercles here being largest of all ; between this 
costa and the side are indications of two other cost®, the outer one being decidedly the most 
distinct, these are composed of distant, very small, setiferous tubercles, there are also a few 
exceedingly minute tubercles scattered on the intervals near the base, each carrying a shoit 
seta; the marginal carina is composed of a double row of closely-set bluntisli tubercles, 
which gives to the margin a finely-crenulated appearance : there is no trace of pubescence on 
the upper surface ; the underside is thinly pubescent, the abdomen neither granulose nor 
tuberculate : prosternum very coarsely, deeply, and confluently punctured ; its process very 
strongly produced, smooth and polished. 
Length 6 lines ; width of elytra across the middle lines. 
Yangiliissar. 
