AUSTKALIAN THYNNIDEOUS INSECTS. 
105 
Species I.— Rhagigaster unicohr, Guerin. Voy. Coq. Ins. p. 214. 
Niger punctatus pllis albidis indotus, alis anticis hyalinis apice subinfuscatis ; mandibulis 
simplicibus apicem versus 1-dentatis, abdominis apice utrinque dente parvo alteroque 
medio recurvo arraato. Long. corp. 19 mill. Expans alar. 30 mill. Habitat, Port 
Jackson. Terra Tan Diem. INIus. nostr. communic. D. Jos. Hooker. 
Species II.— Rhagigaster ephippiger, 
Syn.— Diamma ephippigerj Gudrin. Voy. de PAstrolabe, p. 235. Mag. Zool., 1842, 
pi. 103, fig. 1—6. 
$ Niger nitidus antennis, mandibularum apicibus, mesothorace metathorace et pedibus rufis 
anoque fulvo. 
Long. corp. 13 mill. 
Habitat. Kangaroo ’’ insul. In Mus. Reg. Paris. i 
Ohs. —Hgec est 9 . Rh. unicoloris^ teste D. Shuckard. 
Species HI.— Rhagigaster mandibularisy Westw. (Plate 74, fig. 1, ^ , fig. 2, f.) 
Niger punctatus pilis griseis parum indutus, alis anticis hyalinis fusco tinctis, mandi¬ 
bulis supra in medio tuberculo conico armatis, abdominis apice spina unica recurva armato. 
Long. corp. lin. 8^-. Expans, alar* lin. 12^. 
Ohs. —Carina frontalis fere indistincta. Spatium constrictum ad basin segmentorum 
abdominalium subtilissime piinctatissimum. 
5 Niger nitidus, capite maculis duabus frontalibus fulvis, mesothorace metathorace coxisque 
omnibus ferrugineis, pedibus antennisque nigris. Long, corp. lin. 5^. 
Habiut, Port Philip, In ISIus. Saunders et Nostr, 
Species IT.— Rhagigaster MonOt\s(iZ\.vt. Niger nitidus, punctatus; capite tuberculo 
transverse supra basin antennarum valde, alteroque supero minus prominent!, mandibulis 
simplicibus intus apicem versus dente armatis, metathorace supra transverse carinato 
angulis posticis quadratis, abdominis apice spina unica armato; pedibus rufis, alis 
nigricantibus. 
Long. corp. lin. 9^. Expans. alar. lin. 14. 
Habitat, in Australasia. In Mus» Brit, et Nostr, 
Species \.^Rhagigaster hcemorthoidalisy Guerin. Mag. de Zool. 1842, p. 2,* Niger 
rugosus, griseo pilosus, segmentis duobus apicalibus abdominis fulvis spina anali recurva 
nigra ^. 
Long, corp, 15 mill. 
Habitat, Swan River. In Mus. Guerin. 
Species VI.— Rhagigaster integer. 
Syn. — Thynnns integer^ Fabricius. Ent. Syst. 2, 245, Kirby, Mon. Ap. Ang. 1, p. 223. 
Donovan. Ins. N. Holl. 
Ater, abdominis segmentis margine villoso cinereis, capitis fronte cinereo pubescente 
scutello truncate obtuso, ano integro aculeo brevi recurvo. ^. 
Habitat, in Nov. Holl. In Mus. Banks. (Soc. Linn. Lond.) 
Species VII.— Rhagigaster binotatusy Westw, 
$ Niger nitidus, parum punctatus, capite maculis duabus frontalibus fulvis pone insertio- 
nem antennarum. 
Long. corp. lin. 5J, 
Habitat in Terra Van Diemenii. In Mus. Nostr. communic. D. Hooker. Statura 
Rh. mandibularis, $, cui valde affinis coloribus tamen distincta. 
* I possess two specimens agreeing with Guerin’s description as to colour, but only measur¬ 
ing 5 lines long (instead of 15 mill.), and having no tooth in the basal segment to the abdomen 
beneath, no carina between the upper part of the eyes, but having five teeth at the extremity 
of the abdomen, the middle one not being recurved at all. I therefore do not consider this 
insect (which I name Thynnus dccipiens)^ as belonging to the genus Rhagigaster, 
