6 PROCEEDINGS OF THE NATIONAL MUSEUM vol.71 



in marginal and cubital cells, about basal nervure, and widely on 

 each side of nervulus; first recurrent nervue more distant from first 

 intercubitus than second from second intercubitus; legs black, shin- 

 ing, basitarsi silky with pale hair; abdomen dull, extremely finely 

 and closely punctured, at sides with coarse punctures; first three 

 segments with hind margins obscure reddish, third segment with a 

 small yellow mark at each extreme side; segments 4 to 6 with even 

 entire yellow bands, the first narrow, the others successively broader; 

 ventral scopa white. 



Cavinas, Rio Beni, Bolivia, February, 1922 (W. M. Mann). De- 

 scribed from one female. 



Type.—C&t. No. 29077, U.S.N.M. 



DIANTHIDIUM CALLORHINUM, new species 



Male. — Length, 5 to 6 mm. Rather robust, black,with bright lemon- 

 yellow markings; pubescence extremely scanty; head and thorax 

 densely punctured, but shining spaces laterad of the ocelli; mandibles 

 yellow except apex; clypeus, two large curved bars between antennae 

 (shaped something like a tadpole with tail upward), bands along 

 anterior orbits to summit of eye (narrowing above) , and rather broad 

 entire occipital band (going halfway down cheeks), all yellow; scape 

 dark, with a yellow stripe in front; third antennal joint with a light 

 spot; flagellum black above, obscure reddish benea<^h; antennae very 

 much shorter than in D. guadrimaculatum, when extended backward 

 reaching about middle of mesothorax; meso thorax dull, lateral third 

 of anterior border and more than half of lateral borders margined 

 with yellow; scutellum and axillae orange, the former sulcate in 

 middle; mesopleura with strong, well-separated punctures, a yellow 

 spot posteriorly; tegulae black; wings dusk}^, upper part darker but 

 not very dark; second cubital cell more contracted above than in 

 D. quadrimaculatum; femora black, knees narrowly ringed with yellow, 

 anterior and middle femora ferruginous in front; anterior tibiae red 

 in front, yellow on outer side, black behind; middle tibiae the same 

 except that the yellow fails basally; hind tibiae black, largely yellow 

 on apical half; tarsi reddish, very pale yellow on outer side; small 

 joints of hind tarsi dark; abdomen finely but distinctly punctured 

 and shining; first segment with a large yellow spot on each side and 

 a pair of obscure dots between; second with a rather narrow yellow 

 band, tbe broad margin beyond brown; third with yellow band much 

 broader and brown margin less; segments 4 to 6 with very broad 

 yellow bands, and apical segment yellow; apex broadly rounded. 



Type locality. — Near mouth of Rio Mapiri, Bolivia, September (W. 

 M, Mann) . Also from Huachi, Beni, September (Mann) . Described 

 from two males. Close to D. hilineolatum (Spinola), but that is con- 



