250 Mr. F. Smith's Monograph of the 



scutellum inclined and not elevated at its posterior margin ; 

 the abdomen oblong and depressed; the males are said 

 to have the anterior tarsi slightly dilated ; the first of these 

 characters are common to many females not included in 

 the section, and that applied to the males I have been 

 unable to detect. 



The genus most closely allied to Xylocopa is that of 

 Lestisy consisting at present of two Australian species ; 

 in this genus both the labial and maxillary palpi are four- 

 jointed. 



Genus Xylocopa (Latr.) 



Head transverse, subrotundate ; ocelli placed in a 

 triangle on the vertex. Eyes lateral, elongate-ovate, 

 varying in size in the females; in the males varying 

 greatly, in some species occupying the greater part of 

 the head, and closely approximating at their summit. 

 Mandibles short, stout, and usually Avith three blunt teeth 

 at their apex. Maxillary palpi 6-jointed ; the three basal 

 joints much longer and thicker than the three apical ones, 

 each in succession decreasing in length. Labial palpi 

 4-jointed; the basal joint elongate, being five times the 

 length of the second ; the two apical joints minute, and 

 inserted in a line with the other joints. Anterior wings 

 Avith one elongate marginal cell, acute at its apex ; three 

 submarginal cells, the third as long as the first and second 

 united ; the second of an irregular subtriangular shape ; 

 the first recurrent nervure uniting with the second trans- 

 verso-medial nervure ; the second entering the third sub- 

 marginal cell towards its apex. The anterior and inter- 

 mediate tibise with a single spine at their apex ; that on 

 former flattened and obliquely truncate at the apex ; the 

 posterior tibia3 have tAvo simple spines at their apex ; the 

 claws of the tarsi bifid. The legs of the males sometimes 

 elongated ; the intermediate legs, in one or two species, 

 greatly so. 



Species of Eueope. 

 Div. 1.— Males and females similarly coloured. Species 1 to 5. 

 Div. 2. — Males of a different colour to the females. None. 

 Div. 3. — Only one sex of the species known. Species 6 to 7. 



Species of Africa, 

 Div. 1.— Males and females similarly coloured. Species 8 to 13. 

 Div. 2.— Males of a different colour" to the females. Species 14 to 21. 

 Div. 3.— Only one sex of the species known. Species 22 to 40. 



