

13. 



EUMENES ATRICORNIS. 



Order Hymenoptera. Fam. Vespidae. 



Ti/pe of the Genus, Eumenes atricornis Fab. 



EuMENES Lat., Fab., Curt. — Vespa Linn., Fab. 



Antenna as long as the thorax, inserted in the centre of the face, ap- 

 proximating, slightly geniculated, thickened towards the apex, 13- 

 jointed in the male, 1st and 3rd joints the longest, 2nd small, 4th 

 oblong, the remainder decreasing in length and increasing in diameter 

 to the apical joint which forms an incurved claw (1 ^) ; 12-jointed in 

 the female, basal joint the longest, terminal one conical ( ? ). 

 Labrum elongate-trigonate, quadrate at the base, the apex rounded 

 and ciliated (2). 



Mandibles exserted meeting at the apex and forming a rostrum or 

 beak, long and narrow with three notches forming 4 teeth on the in- 

 ternal margin, rounded at the apex (3). 



MaxilliE with the terminal process elongated narrow lanceolate cor- 

 neous at the base, coriaceous and ciliated towards the apex. Palpi a 

 little longer than the maxillary process, slender and 6-jointed, 2 first 

 joints long, 3rd shorter, the remainder slender and shorter, decreasing 

 in length, the apical one being minute (4). 



Mentum (5 a) long, narrow, cylindric and contracted above the inser- 

 tion of the Palpi which are long slender and 4-jointed, two first joints 

 long and clavate, 3rd half the length of the 2nd, 4th very small {b). 

 Labium coriaceous, striated transversely, longer than the mentum, di- 

 lated at the apex and bilobed, each lobe ciliated and glandular at the 

 apex (c). Paraglossce shorter than the lip, narrowed and ciliated to- 

 wards the apex and terminated by a gland {d). 

 Males 7nore slender than the females, the latter armed with a sting. Head 

 orbicular, clypeus notched : eyes much less remote above in the male than 

 female, deeply notched above the antennee : ocelli 3 in triangle near the 

 crown. Thorax globular ; collar very narrow in the centre, forming 2 di- 

 lated trigonate lobes on the sides. Abdomen arched, loith the basal seg- 

 ment contracted and campanulate, the remainder forming an ovate conic 

 mass, the 2nd segment being very large. Wings, superior folded longi- 

 tudinally, with one marginal and 3 complete submarginal cells. Legs rather 

 short and not stout, anterior the shortest. Tibiae clavate, spurred at the 

 apex. Tarsi 5-jointed, basal joint very long in the posterior, the others 

 very short in the anterior: claws bifd ; pulvilli distinct (8, afore leg). 



Atricornis Fab. — Curt. Guide, Gen. 696. 1. 



In the Author s and other Cabinets. 



The genus Eumenes is composed of a portion of those Wasps that 

 are solitary in their habits; not congregating and forming nests like 

 the common Wasps and Hornets. 



