66 ILLUSTRATIONS OF SOME GENERA OF 
Specirs 4.—CHLORION (AMPULEX) ANGUSTICOLLE, Spinola. (In Ann. Soc. 
Ent. de France 1841, p. 108*.) 
From Cayenne. 
Sercies 5.—CHLORION (AMPULEX) ASNEUM, Spinola. (In Op. cit. p. 110.) 
From the coast of Malabar. 
Species 6.—CHLORION (AMPULEX) COMPRESSIVENTRE, Guérin. (Icon. 
R. An. Ins., pl. 70, fig. 4.) 
Specirs 7.—CHLORION GUERINI, Dahlbom. (Hym. Europ. p. 29.) 
The following is the description of the figures illustrating the 
structure of the insects of this genus, taken from C. compressum. 
Fig.2 a is the head of the male, with the mandibles removed, 
showing its clypeus to be less porrected than in the female 
(fig. 2d.) Fig. 26 represents the labrum detached, and 2 c the 
mandible of the male, with a strong tooth on the inside below the 
apex. Fig. 2 d is the head of the female, with the mandibles and 
base of the antenna; the former with the inner edge slightly pro- 
duced below the apex. Fig. 2 e is the maxilla; 2 f the mentum 
and labial palpus, seen from beneath; and 2g the same seen late- 
rally, this figure showing the inflected lobes of the labium. 2 h 
represents the apical portion of the tarsi, showing the lobed penul- 
timate jomt and bifid ungues. 
Genus TRIROGMA, Westw. 
(Trans. Ent. Soc., vol. iii. p. 223.) 
Hoe genus olim ex individuo unico maris conditum, nune characteribus utriusque sexs con- 
firmatum. 
Corpus subelongatum punctatum, abdomine ¢. tamen Ilevissimo, ceruleo-nitidum, et ‘pilis 
longis griseis undique villosum. Caput antice clypeo parum producto subdeclivi (fig. 
4a) tuberculoque inter partem inferiorem oculorum armato, in’quo insident ant¢nne. 
Oculi magni laterales margine antico parum emarginato. Ocelli 3, in triangulum dis- 
positi. Antenne in utroque sexu longe graciles, ¢ filiformes, 9 ad apicem attenuate, 
his subconvolutis. Labrum minutissimum exsertum obovatum depressum mem- 
branaceum. Mandibule ¢ valide curvate apice acute intus dente latissimo (angulo 
basali valde prominenti et acuto) : 2 multo angustiores, pone medium marginis interni 
denticulis tribus parvis instruct. Palpi maxillares mediocres articulo 1mo minuto 
2bus proximis majoribus, ultimis tribus elongatis et gracilioribus. Palpi labiales 
4-articulati articulo basali longiori, 2ndo breviori. Thorax oblongo-ovatus; |, collare 
mesothorace multo angustius antice angustum lateribus rotundatis, supra impressione 
longitudinali in lobos duos supra angulatos divisum; metathorax subconicus lateribus 
subangulatis discoque carinis obliquis notato. Ale antice cellula unica marginali, ad 
apicem haud appendiculata 5 tribusque completis, cum quarta inchoata submarginalibus, 
harum cellula 1ma elongata accipit versus apicem venam primam recurrentem, cellula 2da 
minori subtriangulari accipit pone medium venam 2m. recurrentem. Pedes graciles 
femoribus ad basin clavatis, tarsis longis gracilibus articulo 4to simplici, unguibus bifidis 
terminato. Tibie anticee 9 fere inermes, setis minutis instructee, caleari majori intus 
lata bipartita instruete (fig. 46). Tarsi antici Q spinulis ad apicem articulorum tantum 
(fig. 4 c) setisque rigidis minutis subtus instructis. Tibie 4 postice etiam fere inermes, 
bicalcaratze, tarsisque eodem modo armatis. Abdomen ¢ breviter petiolatum, 3-annu- 
* This species is a native of Cayenne, being the only instance I am hitherto acquainted 
with, of the occurrence of any species of this or the allied genera, in South America ; if, indeed 
we except Perty’s genus, Trigonopsis, which will, I think, be found to be closely allied 
to them. 
