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504. 

 HERIADES TRUNCORUM. 



Order Hymenoptera. Fam, Apidae. 



Type of the Genus, Apis Campanularum Linn. 

 Heriades Spin., Lat., Curt. — Anthophora Fab. — Anthidium Panz. — 

 Trachusa Jur. — Megachile Lat. — Apis Linn., Kirb. 

 AntenncB inserted in the middle of the face, scarcely longer than 

 the head, velvety, 13-jointed in the male (1), basal joint the 

 longest and subovate, pilose above, 2nd joint small, subovate, 

 3rd not larger cup-shaped, 4th transverse, the remainder in- 

 creasing in length to the apical joint which is ovate ; shorter 

 and clavate in the female (1 $ ), 3rd joint the smallest, ovate- 

 truncate, the remainder transverse and gradually increasing in 

 diameter to the apical joint which is large and ovate. 

 Labrum alike in both sexes, oblong, a little dilated at the base, 

 the margin ciliated (2). 



Mandibles elongate-trigonate, bifid in the male (3) ; larger with 

 one trifid in the female (3 $ ), having long silky hairs on the 

 inside. 



Maxilla terminated by a long broad lanceolate lobe (4). Palpi 

 very short, biarticulate, basal joint a little the longest and clavate, 

 2nd ovate (b). 



Mentum subelliptical, subtrifid before (5). Lip long, slender, 

 linear, pilose and transversely striated (c). Paraglossa short 

 and lanceolate in the female (5 ? c/). Palpi a little longer than 

 the lip, 3-jointed, basal joint short and ovate, 2nd very long and 

 attenuated, 3rd as long as the 1st, attached outside near the 

 apex of the 2nd, slender and clavate {b). 

 Head orbicular and large in the male : eyes lateral, oval : ocelli large, 

 3 in triangle on the crown. Thorax not larger than the head, glo- 

 bose. Abdomen narrow, cylindric, elongate-ovate, incurved, with a 

 tubercle on the underside of the 2nd joint in the male (6), the ante- 

 penultimate fringed with hair, the apex furcate (a) ; thickly clothed 

 with hairs beneath in the female (6$). Wings, superior with one 

 elongate-ovate marginal cell, 2 perfect submarginal ones, the 2nd 

 receiving 2 recurrent nervures, and 3 discoidal cells. Legs simple 

 similar in both sexes : thighs neai'ly naked : tibite short, posterior 

 the longest, anterior with a spine at the apex, the others with 2 ; tarsi 

 5-jointed, basal joint the longest, especially in the hinder pair, in 

 tvhich it is also the stoutest and pubescent on the inside. Claws bifd 

 in the male. 



Truncorum Linn. — Curt. Guide, Gen. 710. 2. 



In the Cabinets of Mr. Kirby and the Author. 



Heriades is distinjruished from the other Apidae by its labial 

 palpi, which are only triarticulate, and the basal joint is very 

 short. The Paraglossoe are also short, and I could not discover 

 any in the male. 



There are two species inhabitants of this country, and they 

 are supposed to nidificate in posts, rails, holes in old trees, &.c. 



