ar7nah(res in the Hymenopterous genus Colletes. 53 



can be distinguished at a glance by its external characters, 

 the long parallel-sided face, etc. 



Its armature and seventh ventral segment show affinities 

 to those of hracatus, but the secondary dilatation of the 

 sagitta (between the basal dilatation and the " wing ") is 

 very evidently dentiform. 



The lobes of the seventh segment appear less transverse, 

 partly perhaps because they curl inwards much more 

 strongly; their cloudings are also very different. 



The species examined were sent to me by Herr Kohl 

 and Herr Friese. 



16. Coriandri, Perez. PI. VII, 16, 16a. PI. IX, 37. 



17. Phalericus, n. sp. PI. VII, 17, 17a. 



I treat these two species together, as their dissections 

 are practically identical. Their external characters, how- 

 ever, separate them at once ; especially their heads are 

 constructed quite differently, so that they fall under 

 different sections in my tables. 



The simple almost circular lobes of the seventh ventral 

 plate are unlike those of any other species known to me. 

 The wings of the sagittse are produced far beyond their 

 apparent apices, much as in daviesaniis, but with a differ- 

 ent outline. There is a secondary dilatation — not dentiform 

 — between the basal dilatation of the sagitta and its wing. 



Coriandri is an Algerian sp. I have examined a $ 

 determined by the author, and sent to me by M. Vachal, 

 and another taken in Algeria by Mr. Eaton. 



Phalericus I have taken freely in Greece and also in 

 South Italy and at Cerbere — the eastern end of the 

 frontier between France and Spain. Its diagnosis follows. 



Niger, sed 9 apice ventrali fere semper testaceo ; niticlissimus, 

 abdomme subtilissime omnium pimctulato (in segmento basali dis- 

 perse, in reliquis multo densius). Gense in ^ subquadratae, in ? 

 margis transversae. Antennarum art. 3""^ {$) 4*° subaeqnalis. 

 Mesonotum griseo-brunnescente (vix fulvido) mediocriter pilosus ; 

 segmentorum abdominalium disci fusco-subpilosi, apices decolorati, 

 fasciis albis integris, quarum ultima (in ^ saltern) longe angustior 

 qiiam basales videtur ( ? segmentum abdominis secundum fasciam 

 basalem quoque distinctam exhibit, quae in maribus meis omnibus 

 aut detrita est aut omnino deest). Segmentum ventrale ^ sextum 

 basi leniter bicallosum, reliqua segmenta ventralia apicibus plus 

 minusve triangulariter in medio scariosis. 



