376 PROF. WESTWOOD ON THE GENUS PERGA. [May 4, 



nulatis. Caput subdepressum, punctatutn, vertice bicanaliculatOj 

 macula elevata ovali uigra nitida utrinque pone oculos ; antennis et 

 mandibulis nigris. Thorax punctatus, utrinque macula parva nigra 

 ante tegulas et ad originem impressionum duarum obliquarum 

 (scutum mesothoracicuni, medio canaliculatum includentium). Scu- 

 tellum medio impressum, postice utrinque angulatum. Abdomen 

 nitidissimum, pallide luteo-flavidum, dimidio apicali castaneo ; pedi- 

 bus elongatis, concoloribus, apicibus articulorum tarsalium nee non 

 tibiarum duarum posticarum nigris ; corpore toto infra cum coxis 

 et pedibus pallide luteo-flavido. Alee pallide fulvescenti-hyaliuEe, 

 stigmate castaneo, venis fulvis, cellula prima submarginali omnino 

 obliterata, secunda fere tertise aequali, liujus apice obliquo curvato. 



Long. corp. lin. 7, expans. alar. lin. 12. 



Hab. in Australasia. In Mus. Hopeiano Oxonise. 



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 longitu- 

 dinal depressions, and between them a slight central longitudinal 

 sulcus terminating at the anterior ocellus ; the antennae are remark- 

 ably 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 i to ^ of an inch. 



" Inhabits Australia {Lieut. Ince)." Newman. 



An P. ferruginea. Leach ? 



31. Perga VENTRALis. 



Perga {Psetidoperga) ventralis, Guerin-Meneville, Icon. R. An. 

 Ins. texte, p. 399. 



" Antennes noires, avec une petite tacbe fauve sous I'extremite du 

 dernier article. Tete noire en dessus, jaune en dessous. Mandibules 

 noires, labre jaune. Chaperon jaune horde de noirsitre. Un petit 

 point jaune sur I'insertion des antennes. Thorax rugueux, noir, 

 bords lateraux au prothorax, cotes du mesothorax sur les rebords 

 late'raux, tegules des ailes et une petite tache vague aux bords late'- 

 raux 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 I'extremite de I'aile se retre'cissant brus- 

 quement semble tronquee obliquemeut au bord anterieur a partir de 

 la callosite. Pattes d'un jaune fauve, avec 1' extremite des cuisses, 



