82 Trans. Acad. Sci. of St. Louis. 
diminishes in less developed males and is completely obsolete 
in others, leaving only the peculiar discal foveae or short 
transverse setose folds of the second and third segments. 
The female has the abdomen entirely unmodified as a rule, 
but in badium, bicolor, parallelum and some others, the dis- 
cal mark of the second segment — a fovea in some or a trans- 
verse fold in others — seems to remain in that sex. The sixth 
ventral of the maleis obtusely rounded at tip or subtruncate. 
Gastrolobium differs very much from Cryptobium, under 
which name all the species have been described thus far, in 
structure and habitus. The species represented in my cabinet 
may be identified as follows : — 
Head parallel, inflated or moderately narrowed behind the eyes, the basal 
angles always more or less evident and broadly rounded............ 2 
Head gradually narrowed behind the eyes, the sides converging from the 
latter to the neck and evenly, feebly arcuate throughout, the basal angles 
WhHOlly ODSOlCbO.6 604 cesecvevreuwersceeweseee: eeccs cece sues vecundvecRe 
2—Elytral punctures close-set, never more than feebly and partially serial 
IN ATTANGEMENLE. ...eccesccccserccccerceece coeves oes ceceviccceus ces 3 
Elytral punctures sparse, very coarse, arranged in even series. .........23 
3 — Elytra generally pale, rarely black, never pale at tip.......cecceeseee 4 
Elytra black, witha fine, abruptly pale testaceous apical margin.--+:....22 
4-—Pronotum highly polished, without minute ground sculpture of any 
BING sss Sols ceccde Veecweedesce Cone es eke debe eaens WEN) 1 eeu vice cease UM 
Pronotum alutaceous in lustre, the dullness caused by excessively minute 
close-set and regular punctulation, only distinct under comparatively 
high amplification... ccscccocreveecves veccsecccsvccseecverecesvecseedl 
5— Head black or piceous-black in COlor,...¢. ccc cccccescoe coccescsscee 6 
Head pale and concolorous with the prothorax and elytra.......ssse0 220016 
6 — Prothorax black or piceOus-black in COlOL.....cccccsccccesesscccess 7 
Prothorax paler in color and generally concolorous with the elytra....... 9 
7 — Head parallel and straight at the sides for one and one-half times the 
length of the eye behind the latter, the sides thence broadly rounded to 
the neck. Body moderately large and stout, deep black throughout, the 
abdomen feebly rufo-picescent; legs very pale, the antennae dusky; 
head longer than wide, narrower than the elytra in the female, coarsely, 
closely punctate, the ridge between the post-ocular foveae very. pro- 
nounced; prothorax oblong-elongate, parallel, with the sides nearly 
straight, much narrower than the head, the punctures unusually coarse, 
moderately sparse; elytra slightly elongate, two-fifths wider and 
nearly a third longer than the prothorax, parallel, the sides straight, 
abdomen the reader is referred to some remarks upon this subject published 
many years ago by the writer (Bull. Cal. Acad. Sci., II, 1886, p. 159 and 
plate). 
