373. 

 HYLyEUS DILATATUS. 



Order Hymenoptera. Fam. Andrenidae. 



Tyjte of the Genus, Apis annulatus Linn. 



HvLiEUS hat.. Curt. — Prosopis Jur., Fab., Panz. — Melitta Kirb. — 

 Apis Linn. — Sphex Panz. — Vespa Rossi. 



Antennce inserted between the eyes near the middle of the face, 

 approximating, rather short, subfiliform and 13-jointed in the 

 males, basal joint long, robust and slightly pubescent, 2nd sub- 

 globose, 3rd scarcely larger, the remainder subquadrate, slightly 

 increasing in diameter, apical joint conical (I): 12-jointed in 

 the females basal joint long and slender, 2nd and 3rd of equal 

 size, the remainder transverse or quadrate, terminal joint coni- 

 cal (1 a). 



Labrum transverse-oval, ciliated with rather broad but acute 

 bristles (2). 



Mandibles slightly curved, hairy, bifid at the apex (3). 

 M axil ice ; the stalk long, terminated by a short bent ovate lobe, 

 acuminated and ciliated with long bristles at the apex (4). Palpi 

 long and 6-jointed, basal joint scarcely so long as the 2nd, which 

 with the others are of nearly equal length, excepting the terminal 

 joint which is a little longer and very slender, the 4th and 5th 

 clavate (b). 



Mentum long, subelliptical, acuminated before in the centre (5). 

 Lip very short, with a lobe on each side (c). Palpi rather short, 

 4-jointed, 1st and 2nd joints of equal size, 3rd a little smaller, 

 4th slender (b). 

 Head orbicular, transverse. Eyes long and lateral. Ocelli 3 in tri- 

 angle. Thorax globose. Abdomen ovate or conic, convex, distinctlif 

 attached by a short peduncle. Wings with one marginal and 2 sub- 

 marginal cells. Legs alike in both sexes, slender arid clothed only 

 with short hairs. Thighs and tibiae rather short and robust, the 

 latter spurred, the anterior pair having an acute spine at the apex, 

 with a dilated internal edge. Tarsi long and 5-jointed, basal joint 

 in the anterior pair notched on the inside at the base and pectinated. 

 Claws simple. Pulvilli distinct (8, afore leg). 



The convex and almost naked bodies of these little insects 

 give them so different a habit, and the structure of the labium 

 is so dissimilar to the rest of the family (excepting Colletes, 

 pi. 85), that they have been placed at the commencement of 

 the Andrenidae both by Mr. Kirby and Mons. Latreille. 



