Monographie der Bienengattung Centris (s. lat.). ^^9 



All the dorsal segments margined apically with pale testaceous; pubescence sparser, 

 the sculpture of dorsulum and mesopleurae more or less obvious. Length i6 mm. 



marginata n. sp. (or var. of morsei.) 



3. Eyes strongly con verging above; first Joint of flagellum as long as four following 



united; abdomen pruinose above, especially on first two segments, the others 



sparsely; clypeus and labrum white, hoffmannseggiae Ckll. 



Eyes not or scarcely converging above, 4 



4. Front broad, 5 



Front narrow, the distance between the anterior ocellus and apex of clypeus much 



greater than the greatest width of front, " 



5. »Scape wholly dark; mandiblas dark reddish brown, with black tips;« legs dark, 



caesalpiniae Ckll. 

 Scape beneath and mandibles more or less yellowish; legs reddish; abdomen, at 

 least laterally, with bands of pale hairs at apex of dorsal segments 2 — 4, 



rhodopus Ckll. 



6. Pubescence of thorax beneath dark brown or blackish, that on four bind legs entirely 



black; first Joint of flagellum shorter than the following two united, 



atriventris Fox. 



Pubescence of thorax pale beneath, the medial tibiae outwardly and base of bind 

 tibiae externally with pale hairs; first Joint of flagellum nearly as long as the three 

 following united, lanosa Cress. 



I . Centris errans Fox.') 



1899. Centris errans Fox, 9, Natural sc. Philadelphia, pag. 65. 



9. Head and thorax black; abdomen green-black, the apical margin of seg- 

 ments 1—4, or 2—4, the remainder and ventral surface entirely, an irregulär mark on 

 dorsals 2 and 3 laterally, tegulae and the legs reddish-brown, the anterior femora more 

 or less black; scape beneath, sometimes obscurely, base of mandibles, labrum an m- 

 verted T-shaped mark on clypeus, inner orbits as far as Insertion of antennae, whitish 

 yellow; head with pale pubescence, that on cheeks palest, the vertex crossed from eye 

 to eye by a stripe of black hairs; thorax above with pale fulvous pubescence, that on 

 the sides and beneath similar to that of the head in front; fore legs fringed with pale 

 hairs, the short pubescence fulvous; brush of bind legs of a paler fulvous than the 

 pubescence of thorax above; first bind tarsal Joint covered with appressed, fiery-red, or 

 coppery, bristles, oblong, truncate, longer and wider than the bind tibiae; abdomen on 

 first Segment anteriorly, ventraily and at apex with some pale hairs, otherwise nude; 

 wings subhyaline, a dark streak in the marginal cell originating at base, and a similar 

 streak extending from the apex of the same cell in the form of an appendiculation. 

 Length 12 mm. 



Florida: Biscayne ßay. Two specimens collected by Mrs. A. T. Slosson, who, 

 I believe, has other 'specimens of the species. C. errans, whose origin is undoubtedly 

 tropical, as the present specimens should be considered wanderers from the West Indies, 

 who may or mav not have taken up their abode in Florida, is most closely related to 

 C. apicalis and'c insiilaris from Saint Bartholomew and St. Domingo respectiveiy. 



I) Wohl die C versicolor F.! Neue Arten aus einer so variablen Gruppe wie versicolor sind 

 ohne Vergleichung sämmtlicher Verwandten nicht zu begründen. 



