136 RHYNCHOPHORA. 
9. Tachygonus rhombus. (Tab. VIII. fig. 20.) 
Tachygonus rhombus, Casey, Ann. N. York Acad. Sci. ix. pp. 678, 681 (1897) ’. 
Hab. Norta America, Arizona !.—Mexico, Northern Sonora (Morrison). 
Sent us in numbers by Morrison as from Sonora. A small strongly setose form, set 
with numerous ochreous and white pectinate scales, the white scales clustered into a 
dense transverse patch on the suture of the elytra below the base and a spot at each 
hind angle of the prothorax, the vestiture of the under surface dense and white ; the 
posterior femora ferruginous to beyond the middle and armed with one or two sharp 
teeth; the posterior tibie sinuate. 
10. Tachygonus caseyi, sp. n. (Tab. VIII. figg. 21, 21a, 8.) 
Rhomboidal, shining, black, the antenne and legs (the swollen portion of the posterior femora and the apical 
half of the posterior tibie excepted) rufo-testaceous ; somewhat thickly clothed with long, erect, blackish 
and white sete, the upper surface also abundantly set with ochreous and white (or entirely white) pectinate 
scales (fig. 21 a), which on the prothorax are condensed into a small spot near each hind angle, the elytra 
sometimes with a small white tuft near the suture; the under surface densely clothed with pectinate 
white scales, the posterior legs with numerous long, blackish and white sete, the other legs albo-pilose, 
with a few dark sets at the knees. Prothorax very finely punctate, with indications of a smooth median 
line. Elytra broad, transversely cordate ; closely punctate-striate, the interstices narrow and asperate. 
Posterior femora moderately elongate, subclavate, armed with one or two sharp spines. Posterior tibie 
strongly sinuate. 
Length 13-2, breadth 12-13 millim. 
Hab. Mexico, Teapa (H. H. Smith); Guatemaua, Zapote, San Geronimo, Tamahu 
(Champion). 
Five specimens. Very near 7. rhombus, but with the white post-scutellar tufts small 
or obsolete, the posterior knees rufo-testaceous, like the basal portion of the femur. 
The hind legs are similarly formed in the two species. 
11. Tachygonus sinuaticrus, sp. n. (Tab. VIII. figg. 22, 22 a.) 
Rhomboidal, shining, black, the rostrum ferruginous, the antenne, anterior and intermediate legs, and joints 
3 and 4 of the posterior tarsi, testaceous ; somewhat thickly clothed with long, erect, black sete, the 
pygidium with white hairs, the flanks of the prothorax and of the meso- and metasternum sparsely, and 
a small scutellar patch on the elytra (formed by two oblique tufts) densely, set with pectinate white 
scales; the posterior femora and tibie strongly nigro-setose, the vestiture of the rest of the legs white, 
the anterior and intermediate knees each with two dark sete. Prothorax very sparsely, rather coarsely 
punctate, except along the smooth narrow median space. Elytra broad, transversely cordate ; seriato- 
foveolate, the interstices very narrow, somewhat raised, and asperate. Posterior femora moderately 
elongate, armed with one leng and several short teeth. Posterior tibia broad, sinuate. 
Length 23, breadth 14 millim. 
Hiab. Mexico, Atoyac in Vera Cruz (HZ. H. Smith). 
One specimen. Very like TZ. laticrus, but with the prothorax more finely and 
sparsely punctate, the posterior femora Jess elongate and armed with one long spine 
only, the posterior tibiae sinuous and much less dilated, and the scutellar patch smaller, 
formed by two small oblique dense tufts of white scales. 
