Rev. F. D. Morice on Andrena taraxaci, etc. 245 



livens, Fig. 2. 



1. nigro-olivacea. Fig. 1. 

 5. (jiraudi. Fig. 5. 

 4. 



3. ferrugineicrus. Fig. 3. 



4. trunccttilabris, Fig. 4. 



humilis. Figs. 10, 11. 



1 . Pilose process strongly dilated towards the apex. 



Seen laterally, its naked side is much 

 curved,with a strong subapical projection. 

 Basal plate distinctly " shouldered " 

 Process hardly if at all dilated. Seen later- 

 ally, its naked side is nearly straight, and 

 the tooth hardly noticeable. Basal plate 

 gradually constricting towards the process, 

 without "shoulders" ... 



2. Pilosity long, stretching far beyond the apex of 



the segment. Subapical tooth less pro- 

 minent ... ... ... ...' 



Pilosity much less developed, hardly passing 

 the apex of the segment, Tooth very 

 sharply prominent ... 



3. Process very long and narrow 



Process ordinary ... 



4. Process rather broad throughout ... 



Process slender but dilated before the apex ... 



5. Dilatations slight, merely angular. Pilosity 



confined to a pair of lateral bunches starting 

 from the geniculation, between which pro- 

 jects the naked apex ... ... ... ... 10 



Dilatations very strong, and tooth-like, making 

 the process cruciform. Pilosity highly and 

 paradoxically developed ... 



6. Lateral outline of pilosity simple, without 



separately projecting tufts on the dilatations 

 Dilatations with tufts which project laterally 

 far beyond the rest of the pilosity ... 



7. Process (beyond the dilatations) very elongate. 



Its apex narrowly truncate. Pilosity not 

 thick enough to conceal its outline even in 

 the ventral view. Below the dilatations the 

 segment is more than twice as wide as at 

 the apex ... 

 Process short and stumpy with rounded apex. 

 Pilosity quite concealing its outline in the 

 ventral view. Hardly wider below the dila- 

 tations than near the apex 



8. Process (beyond dilatations) nearly square. 



Pilosity excessively villose and long; seen 

 ventrally and dorsally it projects far beyond 

 the apex of the segment into two tufts or 

 plumes which curl conspicuously outwards ; 

 seen laterally the hairs are as long or longer 

 than the process, and project from it almost 



at right angles 



Sides of process sinuated inwards and apex 

 bilobed. Segment just below dilatations 

 twice as broad as in senecioma. Pilosity much 

 thinner, not hiding the outlines of the pro- 

 cess even in the ventral view, and curling 

 not outwards but inwards round the apex ; 

 seen laterally it is decumbent and of 

 moderate length 9. stahiana, Fig. 8. 



Of the above species it may be noted that the ^ clypeus seems to 

 be always 



white in ferruginekrus, iruncatilabris, and girmull: 

 black in nigro-olivacea, livens, taraxaci, curtivalvis, senecionis, 

 and stahiana. 

 In humilis it may be white or black, usually the former. 



6. taraxaci. Fig. 6. 



7. curtivalvis, Fig. 7. 



8. senecionis. Fig. 9. 



