470 RHYNCHOPHORA. 
GERSTAECKERIA, gen. nov. 
Ventral segments 2-4 subequal in length, the sutures straight and deep; the femora unarmed; the other 
characters as in Acalles. 
Type, Acalles bifasciatus, Gerst. 
Several North-American and Mexican species hitherto referred to Acalles differ 
from it in having a short second ventral segment, separated from the first by a straight 
deep suture, and they can no longer be included in the genus, if Orypterus, EHuxenus, 
Euscepes, &c. are to be retained. These insects, all of moderate or large size, have 
the prothorax rounded at the sides and densely punctured; the elytra oval, very 
coarsely seriate-punctate ; the legs stout (especially in G. bifasciata) ; and the femora 
unarmed. Gerstaeckeria will include Acalles porosus, Lec., and probably various other 
forms from the Southern United States described by Leconte or Casey. 
1. Gerstaeckeria bifasciata. (Tab. XXIII. figg. 6, 6 a.) 
Acalles bifasciatus, Gerst. Stett. ent. Zeit. 1860, p. 8937. 
Hab. Mexico! (Mus. Berol.) Zimapan in Hidalgo (Hége). 
This species was found in numbers on Cactus by Ehrenberg, according to Gerstaecker, 
and one of the specimens described by him has been given us by the authorities of the 
Berlin Museum. It is larger and more robust than any of the allied forms; the legs 
are very stout, and the third tarsal joint is scarcely wider than the second. 
2. Gerstaeckeria cruciata, sp. n. 
Oblong-ovate, dull, black, the antennz and tips of the tarsi rufo-piceous ; variegated above with coarse 
ochreous, whitish, and fulvous scales, the light-coloured scales condensed into a few small scattered spots 
on the prothorax, a short oblique streak below the humeri, and a common cruciform or T-shaped post- 
median fascia on the elytra, the suberect, very short, stout, setiform scales clustered into dense, compact, 
broad lines on each of the interstices, the legs squamose, the femora and tibie annulate. Head and 
rostrum closely, rather coarsely punctate (feebly carinate in one specimen), the interocular space shallowly 
grooved down the centre; antenne inserted near the middle of the rostrum, joints 1 and 2 of the 
funiculus subequal in length, the club ovate. Prothorax transverse, convex, rounded at the sides, 
narrowed and feebly constricted in front, truncate at the base; coarsely, densely punctate. Elytra 
ovate, at the base slightly wider than the prothorax; coarsely seriate-punctate, the interstices rather 
broad, feebly convex, and closely punctate. “Ventral segments coarsely, closely punctate. Legs short 
and stout, the femora unarmed. 
Length 6-63, breadth 3-3} millim. 
Hab. Mexico, Toxpam in Vera Cruz (Sallé), Mexico city (Hage). 
Three specimens. Very like G. bifasciata, but smaller, the legs not nearly so stout, 
the third tarsal joint much wider than the second, the post-median fascia of the elytra 
not interrupted at the suture, &c. Acalles porosus, Lec., from Colorado, is another 
very similar form. 
