108 Mr. Malcolm Burr’s Preliminary Revision of the 
Mus. Zool. Torino, vol. xxi, no. 531, p. 16. (1906.) (Costa 
Rica.) 
The only known species of this genus very closely 
resembles A. impennis, Borm., and under that name I 
received a specimen from de Bormans’ collection ; on com- 
paring, however, with the type of dmpennis, in the Biologia 
Centrali-Americana collection, it is obviously different ; it 
is remarkable for the flattened and dilated abdomen, and 
trapezoid elytra, which are cut away at the basal posterior 
angle, to show a small scutellum. It has since been 
described and discussed by Borelli (J. ¢.). 
Genus 4.—VLAX,* nov. gen. 
Statura minore ; corpus minus depressum et minus dilatatum ; 
abdomen ¢ lateribus in mucrones acutos recurvos haud productis sed 
integris, inermibus, vel paullo angulatis vel tuberculis instructis ; 
ceteris cum Ancistrogastre congruet. 
Type of the genus.—Ancistrogaster championi, Bormans, 
1893, Biol. Centr.-Amer. Orth., p. 10, Pl. I, fig. 13, ¢. 
(Panama.) 
This removes from <Ancistrogaster those small, pale 
species, with the abdomen but little dilated, and the sides 
of the abdominal segments not curved backwards into 
flattened and sharp hooks, but furnished with blunt 
tubercles. 
A. tolieca, Dohrn., and A.intermedius, Burr, will also fall 
into this genus. : 
Genus 5.—ANCISTROGASTER, Stil. 
Antenne 10-12 segmentate ; segmentis 3 et 4 subaquantibus ; 
ceteris elongatis, cylindricis ; caput subtumidum, margine postico 
emarginato ; pronotum caput latitudine wquans, antice truncatum, 
postice rotundatum ; elytra ad humeros rotundata, lata, margine 
postico truncato vel emarginato: carinula humerali acuta, usque ad 
marginem posticum elytri percurrenti: ale long ; pedes graciles; 
femora vix incrassata; tarsorum segmentum primum cetera duo 
unita longitudine squans: abdomen depressum, basi angustum, 
medio valde dilatatum, ante apicem iterum angustatum ; plicis later- 
alibus distinctis : ¢ segmentorum latera producta, in mucrones valde 
deplanatos, acutos et recurvos producta ; ¢ abdomen inerme, minus 
dilatatum, minus depressum : segmentum ultimum dorsale ¢ breve, 
* Gr, BAd~=simpleton. 
Sn 
