f 



628. 

 CHELOSTOMA FLORISOMNIS. 



Order Hymenoptera. Fam. Apidge. 



Type of the Genus, Apis florisomnis Linn. 



Chelostoma Lat., Curt. — Megachile Lat. — Trachusa Jur. — Hylseus 

 Fab. — Anthophora Fab. — Anthidium Panz. — Apis Linn., Kirb. 

 Antenn(BmsQvte& in front of the face, considerably longer tlian the 

 head, filiform and 13-jointed in the male (1 ^), basal joint long 

 stout and hairy, 2nd the smallest, the following joints oblong 

 and angulated intemall)", giving them the appearance of a 

 twisted rope, the apical joint oval : short and clavate in the 

 female (1 ? ), the 2nd joint longer than the 3rd, 4th and fol- 

 lowing cup-shaped and gradually increasing in diameter, apical 

 joint ovate-conic. 



Labrum oblong, attenuated anteriorly, ciliated and truncated 

 (2 (J), t^vice as long in the female and more attenuated (2 $ ). 

 Mandibles bifid at the apex, short and externally hairy in the 

 male (3), long curved and porrected in the female and very 

 pilose internally. 



Maxilla, stipes elongated (4), terminated by a long inflected 

 membranous lobe, lanceolate and very acute. Palpi yery small, 

 composed of 3 ovate joints. 



Mentum elongated, elliptic, biemarginate before (5). Tongue 

 long slender and linear (c). Palpi rather longer, slender, at- 

 tenuated, compressed, attached to short broad scapes, 4-jointed, 

 basal joint oblong, 2nd very long, membranous, thickened at 

 the inner edge, 3rd short and slender, a little pubescent at the 

 apex, 4th the same length, attached obliquely, a little clavate- 

 truncate {b). 

 Head rather small in the male, the cheeks forming an obtuse tooth by 

 the base of the mandibles ; large and more quadrate in the female : 

 eyes lateral, elongate-ovate : ocelli 3 in triangle on the crown. 

 Thorax ovate, especially in the female. Abdomen linear in the 

 male (Jo ^), very much incurved, with a trigonate protxiberance be- 

 neath near the base, a ciliated cavity under the 4th segment, the 

 apex bidentate (7) with a recurved bifid process in the centre : ellip- 

 tic in the female, narrowed towards the base, the underside densely 

 hairy (6 $ ). Wings with 1 marginal and 2 submarginal cells, the 

 2nd receiving 2 recurrent nervures. Legs neither long nor stout .- 

 tibiae rather short and stout : tarsi 5-jointed, basal joint very long 

 in the hinder pair, rather stout and densely pilose inside in the fe- 

 male : claws short broad and cleft in the males, acute in the females, 



Florisomnis Z-mw. ^ . — maxillosus izwre. ? . — Curt. Guide, Gen. 709. 

 Black, shining, thickly and minutely punctured, slightly clothed 

 with ochreous down, hinder margin of wings brown, ner\Tires 

 piceous : male with the face densely clothed with soft yellow 

 hairs, abdominal segments fringed with whitish hairs on the 

 sides, underside of 4th segment ochreous : female with the in- 

 ternal margin of the mandibles ciliated with ferruginous hairs 

 as well as the hinder tarsi ; underside of abdomen clothed with 

 ochreous hairs, the segments neatly margined with white above, 

 interrupted down the back. 



