314 HETEROMERA. 
sparingly punctured, and very shining; and the elytra have rows of much finer and 
shallower impressions. 
The unique example before me is somewhat immature. 
3. Helops longicornis. 
Elongate ovate, moderately convex, brownish-bronze, rather shining. Head closely, unequally, and somewhat 
coarsely punctured, the intraocular space with coarser and longitudinally confluent impressions, the 
epistoma truncate in front and limited behind by a rather deep transverse groove ; antenne very long, 
passing the middle of the elytra in the male, joints 9 and 10 scarcely wider than the preceding, the apical 
joint in the male much longer than the tenth, and slightly curved, brownish-piceous ; prothorax nearly as 
long as broad in the male, transverse in the female, moderately convex, very feebly margined, the sides 
slightly rounded about the middle, obliquely but not strongly narrowing from a little before the middle to 
the base, and very feebly sinuate and about equally narrowing in front, the apex straight (when viewed 
from above), the anterior angles rounded and rather deflexed, the base almost straight, the basal foves 
very shallow, the hind angles rather obtuse, the surface closely, rather coarsely, and somewhat unequally 
punctured, the punctures rather more scattered on the disc, and closer, and here and there confluent 
towards the sides; elytra long, somewhat depressed, gradually widening to some distance beyond the 
middle, the base subtruncate, the humeri scarcely prominent, narrowly striate, the striz closely and 
somewhat coarsely punctured, the interstices a little convex, and finely, shallowly, and sparingly punc- 
tured; legs brownish-piceous, the tarsi ferruginous, the anterior tarsi a little dilated in the male; beneath 
brownish-piceous, the coxe reddish-ferruginous, slightly shining, coarsely (the flanks of the prothorax 
still more coarsely and subconfluently) punctured ; the ventral surface very much smoother, and finely and 
shallowly punctured and wrinkled, the last ventral segment hairy in the middle in both sexes, the 
segments 1-3 in the male more finely and closely punctured along the centre ; prosternum strongly 
declivous ; mesosternum simple. 
Length 10-11 millim.; breadth 4-43 millim. (3 @.) 
Hab. Mexico, Ciudad in Durango 8100 feet (Forrer). 
Three examples. This insect is allied to the North-American H. cisteloides, Germ. 
(placed by Allard in his genus Coscinoptilix), but less convex, the head differently 
sculptured, the elytra punctate-striate, the prosternum more strongly declivous, the 
femora beneath and the last ventral segment not so thickly clothed with hair, &c. In 
one of the examples before me the elytral interstices are almost flat, in the other 
two convex. 
4. Helops exsculptus. (Tab. XIII. fig. 23, ¢ .) 
Elongate ovate, moderately convex, dark brownish-bronze, usually very slightly tinged with green or cupreous, 
slightly shining. Head closely, coarsely, and irregularly punctured, the epistoma broadly but feebly 
emarginate in front and limited behind by a shallow or rather deep transverse impression ; antenns 
rather long and stout, the apical joint in the male longer than the tenth ; prothorax rather longer than 
broad, not very convex, narrowly but very distinctly margined, widest anteriorly, the sides slightly 
narrowed and sinuous behind the middle and sometimes sinuous before the apex, the apex almost straight 
(if viewed from above), the anterior angles rounded but rather prominent, the base subtruncate, the 
basal foves rather deep, the hind angles subrectangular, the disc raised in the middle in front, shallowly 
transversely impressed before the base, and often with indications of a fine shallow central groove, the 
surface closely and somewhat coarsely punctured, the punctures a little more scattered on the disc, but 
closer and here and there subconfluent at the sides; elytra long, rather wider than the prothorax, a little 
flattened on the disc, but subvertical at the sides from the seventh interstice, subtruncate at the base, the 
sides straight in front and widening and a little rounded beyond the middle, the humeri rather prominent, 
