Insects. 695 



capture a specimen at Byfleet, near Weybridge : it is totally distinct 

 from any previously known British species. I also captured a male 

 Megachile in the same locality ; and it also being distinct from those 

 previously known, is very probably the male of the present species. 

 Not being certain of this, 1 shall describe it under another name ; fu- 

 ture discovery will probably prove the necessity of uniting them. 



Sp. 6. Megachile rufitarsis, Smith. 



Male. — Length 5 lines. Black. Face clothed with pale yellow 

 hair, as well as the cheeks ; the antennae filiform. The thorax is 

 clothed with an ashy pubescence, thinly so on the disk. The ante- 

 rior coxae are armed with a small somewhat acute spine ; the anterior 

 tarsi pale rufous ; the intermediate and posterior tarsi rufous, except 

 their first joint, which is black above. The abdomen has a pale nar- 

 row fascia on the margins of the second, third and fourth segments ; 

 the sixth segment is emarginate, the seventh has a minute tooth in 

 the centre. The abdomen is globose at the apex, and curved under, 

 as in Chelostoma. 



N. B. — This description is drawn up from a specimen which had 

 evidently been some time disclosed ; and doubtless the pubescence 

 would be more rich in recent specimens. 



Sp. 7. Megachile centuncularis. 

 Apis centuncularis, Linn. ; Kirby's Mon. 



Female. — Length 4 — 6 lines. Black. A few pale yellow hairs 

 close to the inner orbits of the eyes. Maxillae quadridentate, the two 

 exterior teeth acute. The abdomen thinly clothed with a pale yellow 

 pubescence, darkest on the disk. All the tarsi rufous beneath. The 

 second, third, fourth and fifth segments of the abdomen have a nar- 

 row fascia of pale fulvous hair laterally, the fifth fascia frequently en- 

 tire ; beneath, the abdomen is entirely clothed with bright fulvous 

 hairs, the sixth segment is somewhat acute. 



Male. — Length 4 — 4j lines. Black. The face covered with bright 

 yellow hair ; the cheeks with hair of a paler colour. Antennae fili- 

 form. The thorax is clothed above with a pale yellow pubescence, 

 beneath, inclining to ashy. The anterior legs have coxae unarmed, 

 and the femora fringed beneath with pale yellow hairs. The abdo- 

 men has the second, third, fourth and fifth segments margined with 

 yellow hairs, sometimes interrupted, the sixth segment is entire, and 

 the ventral obsoletely tridentate. 



The original specimen of this species in the Linnaean cabinet, to 



