238 H. Friese. 



o. Abdomine segmentis dorsalibusy, ventralibus 6, inermibus; clypeus labrumque 

 plerumque albidi; metatarsi angusto paralleloque, tibiis multum angustioribus, tibiis 

 posticis metatarsisque longissimis, saepe radiiforme pilosis. 



Da Smith 1874 sehr brauchbare Diagnosen von Centris und Epicharis, die ich 

 zu einer Gattung vereinige, in englischer Sprache gegeben hat, so lasse ich beide im 

 Interesse der Ausländer hier folgen. 



Smith schreibt in Ann. and Mag. Nat. Hist. (4), XIII, 1874, pag. 3i8 von Epi- 

 charis: 



»Head not so wide as the thorax; eyes elongate-ovate, ocelli 3 placed in a slight 

 curve on the vertex; antennae geniculate, flagellum filiform, i. Joint narrowed to its 

 base; labial palpi 4-jointed, 2 basal joints elongate, i. one third longer than the 2., both 

 flattened and membranaceous within, 3.-4. minute, attached near the apex of the 2. 

 Joint; maxillarv palpi 2-jointed, basal Joint large, barrel-shaped, w^ith its apex 

 truncate, 2. Joint pear-shaped and minute; mandibles stout, with 3 blunth teeth at 

 their apex, Thorax: the anterior and intermediate tibiae with a single spine at their 

 apex, the posterior tibiae with 2 spine, the inner one pectinated; the anterior wings 

 with I marginal cell, pointed at the base and rounded at its apex, having 3 submarginal 

 cells, I. and 2. of nearly equal length, 2. narrowed towards the marginal cell, 

 receiving the i. recurrent nervure a little beyond the middle, 3. submarginal cell about 

 2 thirds of the length of the 2. submarginal and receiving the 2. recurrent nervure near 

 its apex. 



»Charakter von Ep. rustical«. 



Weiter pag. 357 von Centris: »Head not so wide as the thorax; eyes large, lateral, 

 elongate-ovate, ocelli placed in a curve on the vertex; antennae geniculate, flagellum 

 filiform, I. Joint graduallv narrowed to its base; labial palpi 4-jointed, 2 basal Joints 

 elongate and flattened, i. longer than the 2., 3. — 4, minute and attached to the 2. Joint 

 near its apex; maxillary palpi 4-Jointed, i. and 4. joints shorter than the inter- 

 mediate ones; mandibles stout and with 4 blunt teeth in the 9. Thorax: anterior and 

 intermediate tibiae with a single spine at their apex; the posterior pair with 2 spines, 

 the inner one pectinated: the anterior wings with one marginal and 3 submarginal cells, 

 the marginal cell oblong, nearlv as long as the 3 submarginals united, widest in the 

 middle, truncate at the base and more or less rounded at the apex, from which an 

 appendicular nervure is emitted, which sometimes runs nearly to the anterior margin 

 of the wing; submarginal cell i. is divided by a more or less distinct transverse, per- 

 pendicular, fals nervure, 2. cell is wider than the i. and narrowed towards the 

 discoidal cells, receiving i. recurrent nervure towards the i. submarginal, 3. sub- 

 marginal much narrowed towards the marginal cell. 



»Note. Mandibles tridentate in the o of many species.« 



Die Bienengattung Centris steht zwischen der Gattung Podaliriiis einerseits und 

 Euglossa andererseits, von ersterer hat sie den Sammelapparat, der nur in grösserer 

 Mächtigkeit die Hinterbeine bedeckt, von letzterer (Eiilema) Form und Habitus wie 

 die zum Theil prächtigen Farbenzeichnungen; diese bringen sie auch unseren paläarkti- 

 schen Hummelarten oft sehr nahe. Unter allen Bienen ist Centris an der kolossal ent- 

 wickelten Behaarung der Beine III (cT wie 9) zu erkennen. 



Schwarz, das Abdomen entweder schwarz, roth, blau oder blaugrün, mitunter 

 auch mit gelben Binden auf den Segmenten, dabei schwarz, grau, braun, gelb und selbst 

 weiss behaart, das Abdomen oft mit prachtvollen gelben Haarbinden geziert, so prä- 

 sentirt sich die artenreichste und stattlichste Bienengattun^ von Südamerika. 



