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Show 376 PROF, WESTWOOD ON THE GENUS PERGA. [May 4, nulatis. Caput subdepressum, punctatum, vertice bicanaliculato, macula elevata ovali nigra nitida utrinque pone oculos ; antennis et mandibulis nigris. Thorax punctatus, utrinque macula parva nigra ante tegulas et ad originem impressionum duarum obliquanim (scutum mesothoracicum, medio canaliculatum includentium). Scutellum medio impressum, postice utrinque angulatum. Abdomen nitidissimum, pallide luteo-flavidum, dimidio apicali castaneo; pedibus elongatis, concoloribus, apicibus articulorum tarsalium nee non tibiarum duarum posticarum nigris; corpore toto infra cum coxis et pedibus pallide luteo-flavido. Alae pallide fulvescenti-hyalinae, stigmate castaneo, venis fulvis, cellula prima submarginali omnino obliterata, secunda fere tertiae aequali, hujus apice obliquo curvato. Long. corp. lin. 7, expans. alar. lin. 12. Hab. in Australasia. In M u s . Hopeiano Oxoniae. 30. PERGA SCABRA, Newman, Zoologist, 1846, t. 4. p. 1274. "Colour brown, the legs being paler than the body. The head is of nearly equal width with the prothorax and semiporrected ; the ocelli are placed in a triangle, the base of which is much the longest, the anterior ocellus being but little in advance of the other two ; every part of the head is rendered scabrous by irregular, deep, and often confluent punctures; the vertex has, moreover, two vague longitudinal depressions, and between them a slight central longitudinal sulcus terminating at the anterior ocellus ; the antennae are remarkably short, even for the genus, when extended laterally they scarcely reach beyond the eyes. The prothorax is sculptured in the same manner as the head, and has various depressed spaces and elevated ridges, all of which have a longitudinal direction. The abdomen is glabrous, its extremity much recurved. The wings partake of the brown colour of the entire insect. " The length varies from •§• to -g- of an inch. " Inhabits Australia (Lieut. Ince)." Newman. A n P. ferruginea, Leach ? 31. PERGA VENTRALIS. Perga (Pseudoperga) ventralis, Guerin-Meneviile, Icon. R. An. Ins. texte, p. 399. " Antennes noires, avec une petite tache fauve sous l'extremite du dernier article. Tete noire en dessus, jaune en dessous. Mandibules noires, labre jaune. Chaperon jaune borde de noiratre. U n petit point jaune sur l'insertion des antennes. Thorax rugueux, noir, bords lateraux au prothorax, cote's du mesothorax sur les rebords lateraux, tegules des ailes et une petite tache vague aux bords lateraux de i'ecussion jaunatres. Dessous du prothorax jaune. Dessous du mesothorax noir, avec une large tache jaune de chaque cote. Ailes hyalines a nervures rougatres, le point epais est tres dilate', aussi large que la cellule radiale; et l'extremite de l'aile se retrecissant brus-quement semble tronquee obliquement au bord anterieur a partir de la callosite". Pattes d'un jaune fauve, avec 1' extremite des cuisses, |