MONOíiKAPHIE DEE BIENENGATTUNG EUGLOSSA. 125 



The above characters are those of the type of the genus, Eulcma 

 diuiidiata. This genus can only be separated from that of Eufjhssa by an 

 examination of the oral organs. I have failed to observe more than 

 2 joints in the labial palpi and upon this circumstance alone have 7 kept 

 it separated from Einjhissd. 



The characters given by Lepeletier are not reliable and the diffe- 

 rence which he alludes to in the neuration of the wings has no existence ; 

 in both genera the neuration is the same. The labrum varies slightly in 

 the species, being sometimes square, sometimes slightly narrowed ante- 

 riorly. The cf in both genera have the posterior tibiœ thickened, being 

 convex outwardly. The scutellum is sometimes flat, sometimes a little con- 

 vex ; it has frequently a fossulet at its jiosterior margin or a depression, the 

 sides of which are elevated so as to become bituberculate. The dilated poste- 

 rior tibiœ, fringed at the sides and thus forming a backet (similar to that 

 on the legs of the hive bee), has led to the supposition of the insects of this 

 genus being social ; but direct observation proves the contrary. These bees 

 are furnished with ^ spines at the apex of the posterior tibiae, which none 

 of the permanentlj^ social genera possess. 



The genus Bnnihux which is temporarily social, has spines similar 

 to the genera Ktilciini and Eu(jloss/i, and has also the posterior tibia^ ex- 

 panded and fringed at the sides in the same manner as those genera. Thus 

 we have a gradation in structure, as well as in habit from EuJema to 

 EíKj]ní<s(i and thence on to Ilonihns and the genera, Mel ipoiui, Trifjoiui up 

 to the genus Ajiis.» 



Euglossa wird von Smith 1874 charakterisirt : 



vEufjlossd : Maxillary palpi 2-jointed, basal joint hidden in a cavity, 

 2 spindle-shaped, with a long bristle at ist apex ; labial-palpi 4-jointed ; 

 2 basal joints elongate, 3^ — 4 minute, attache to the 2 joint near its apex; 

 labrum quadrate, with the anterior angles rounded. Mandibles tridentate. 

 Wings and legs as in the genus Enlciim. The body in some species entirely 

 naked. » 



Die bisher bekannt gewordenen Arten (43) scheinen kaum den dritten 

 Theil aller existirenden Formen auszumachen ; — ich schätze die Zahl 

 aller Arten auf loO bis 120, so dass auch hier die genaueste Yergleichung 

 bei Neubeschreibungeu geboten erscheint. Nach dem bisher bekannten Ma- 

 terial zerfallen die Formen in 3 Subgenera und 15 Gruppen. 



I. Subgenus Euglossa s. str. — Körper übcriiil sehr sparsam behaart, die 

 Grnudfarbe des Chitins nicht beeinträchtigend, Mimdgegend weiss gefärbt; Zunge 

 von doppelter Körperläuge, Labiidtaster 4-gliederig, Scutellum $ mit schwarzem 

 Sammtfleck, kleinere Formen 10 — 20 mm. lang. 



