340 SUPPLEMENT. 
MITOSTYLUS (to follow the genus Cautoderus, p. 170). 
Mitostylus, Horn, Proc. Am. Phil. Soc. xv. p. 107 (1876). 
‘Two species of Mitostylus have been described by Horn—d/, tenuis from Texas and 
M. gracilis from Lower California,—the genus, as anticipated (anted, p. 208), extending 
into Mexico, the first-mentioned insect having been taken in Coahuila by Dr. Palmer. 
Chetopantus, Sharp, scarcely differs from MJitostylus, except by the more strongly 
setose body, a character of no value in Derosomus. 
1. Mitostylus tenuis. 
Mitostylus tenuis, Horn, Proc. Am. Phil. Soc. xv. p. 107"; Mitchell and Pierce, Proc. Ent. Soc. 
Wash. xiii. p. 48 (1911) ’. 
Hab. Nortu America, ‘Texas! 2.—Mexico, Monclova in Coahuila (Dr. Paliner). 
A single worn specimen, agreeing with one before me from Beeville. It has been 
found in large numbers on Amphiachyris dracunculoides in Victoria County, Texas *. 
PYTHIS, gen. nov. (to follow Sciadrusus, p. 172). 
Rostrum very short and broad, not longer than the exposed part of the head, the upper portion obliquely 
narrowing from the eyes te the points of insertion of the antenne, the scrobes lateral, narrow, abruptly 
angulate, and descending ; head broad, the eyes prominent and rather large; autenne very slender, the 
scape abruptly clavate at the tip and reaching the front of the prothorax, joint 1 of the funiculus twice 
as long as 2, 3-7 short and obconic, the club long and acuminate; mentum almost filling the buccal 
cavity, tumid down the middle; prothorax ample, transverse; scutellum minute; elytra oval, short, 
the humeri distinct, the lower margin feebly sinuate; ventral segments 2 and d subequal in length, 
3 and 4 short, the first suture arcuate; legs slender; anterior tibia unguiculate; articular surface of 
posterior tibie terminal; tarsal claws subconnate at the base; body convex, apterous, squamose and 
setose. 
Type, P. amplicollis. 
This genus belongs to the Sciaphilina as defined by Dr. Sharp (anted, p. 167). 
The relatively broader head and prothorax and the short oval elytra distinguish it 
from Mitostylus, Chetopantus, Sciadrusus, kc. The distinctly developed humeri and 
the broad head and prothorax separate Pythis from Sciomias. 
1. Pythis amplicollis, sp.n. (Tab. XV. figg. 28, 28 a.) 
Ovate, shining, piceous, the antenne (the tip of the club excepted) and tarsi rufo-testaceous; variegated with 
pale brown, fuscous, and whitish scales, the whitish scales condensed into a stripe along each side of the 
head and prothorax, and a streak at the base of the fifth and seventh elytral interstices, the prothorax 
with three faint darker brown vitte on the disc; the upper surface also set with numerous short, erect, 
fine, pallid sete, those on the elytra uniseriately arranged down each interstice. Head (with the 
promineut eyes) nearly as wide as the prothorax, the rostrum flattened, obsoletely carinate down 
the middle anteriorly, both densely, rugulosely punctate, Prothorax constricted just before the middle, 
narrowed in front and behind, punctured like the head. Elytra considerably wider than the prothorax, 
convex, punctate-striate, the punctures very fine (as seen with the vestiture intact, but when the scales 
are removed appearing coarse and closely placed), the interstices convex. 
Length 4, breadth 13-1} millim. (@.) 
Hab. Mexico (Trugut), Sierra de Durango (Hége, in coll. Solari). 
