66 
ILLUSTRATIONS OF SOME GENERA OF 
Species 4.—CHLORION (AMPULEX) ANGUSTICOLLE, Spxnola, (InAnn. Soc. 
Ent. de France 1841, p. 108*.) 
From Cayenne. 
Species S.— CHLORION (AMPULEX) ^NEUM, Spinola. (lu Op. cit. p. 110.) 
From the coast of Malabar. 
Species 6.— CHLORION (AMPULEX.) COiAlPRESSIVENTRE, Guhin. (Icon. 
R. An. Ins., pL 70, fig. 4.) 
Species 7.—CHLORION GUERINI, Dahlhom, (Hym. Europ. p. 29.) 
The following is the description of the figures illustrating the 
structure of the insects of this genus, taken from 0. compressum. 
Fig. 2 is the head of the male, with the mandibles removed, 
showing its clypeus to be less porrected than in the female 
(fig. 2 d.) Fig. 2 b represents the labrum detached, and 2 c the 
mandible of the male, with a strong tooth on the inside below the 
apex. Fig. 2 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/* the mentum 
and labial palpus, seen from beneath; and 2 g 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 joint and bifid ungues. 
Genus TRIROGMA, Westw. 
(Trails. Ent. Soc., voL iii. p. 223.) 
Hoc genus olim ex individuo unico maris conditura, nunc characteribus utriusque sexus con- 
firmatum. 
Corpus subelongatum punctatum, abdomine tamen laevissimo, cceruleo-nitidum, et pilis 
longis griseis undique villosum. Caput anlice clypeo parum producto subdeclin (fig. 
4 a) tuberculoque inter partem infcrioieni oculorum armato, in*quo insident antennae. 
OcuU magni latcralcs margino antico parum cmarginato. Ocelli 3, in triangulum dis- 
positi. Antennte in utroque sexu longas graciles, ^ filifortnes, $ ad apicem altcnnata, 
bis subconvolulis. Labniin minutissimum cxsertum obovatum dcprcssam mem- 
branaceum. Mandibular ^ validar curvatac apice acutar intus dento latissimo (angolo 
basali valdo promiucnti et acuto) : $ miilto angustiores, pone medium marginis intemi 
denticulis tribus parvis iustnictjc. Palpi maxillares mediocres articulo Imo minulo 
2bus proximis majoribus, ultimis tribus elongatis et gracilioribus. Palpi lalialcs 
4-ardculati articulo basali longiori, 2ndo breviori. Thorax oblongo*ovatus; ^ collare 
mesotboracc multo aiigustius antice angustum lateribus rotundatis, supra impression© 
longitudinali in lobos duos supra angulatos divisum; metatborax subconicus lateribus 
subangulatis discoque carinis obliquls notato. Alas anticar ccllula unica marginali, ad 
apicem baud appcndiculata ; tribusque completis, cum quarta inciioata submarginalibus, 
barum cellula Ima elongata accipit versus apicem venara primam recuircntera, cellxila 2 da 
minori subtriangulari accipit pono medium venam 2ni, recurrentem. Pedes graciles 
femoribus ad basin clavatis, tarsia longia gracilibus articulo 4 to sitnplici, unguibus bifidis 
terminato. Tibiae anticar 5 fere ineriues, setis minutis instructse, calcari majori intus 
lata bipartita instructae (fig. 4 6). Tarsi antici $ spinnlis ad apicem articulorum tantom 
(%. 4 c) setisque rigidis minutis subtus iustructis. Tibiai 4 posticse eliam fere inermes, 
bicalcaratae, tarsisque eodem xnodo aimatis. 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. 
