8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 71 



sciitellum, except base, all yellow; clypeus strongly punctured, with 

 a smooth median line, supraclypeal area with a large smooth space; 

 meso thorax dull and excessively densely punctured; area of meta- 

 thorax with a biacruate groove, crossed by strong ridges; mesopleura 

 very coarsely punctured; tegulae black; wings stronglj^ dusky, with 

 a dark streak in apical part of marginal cell; first recurrent nervure 

 not quite as remote from first intercubitus as second from second; 

 legs black, middle and hind basitarsi pale yellow on outer side; first 

 two abdomxinal segments very finely and closely punctured, with 

 large yellow marks at sides, that on second much longer and narrower 

 than that on first; segments 3 to 6 with broad lemon-yellow bands 

 and apical segment yellow; apex broadly rounded, slightly truncate. 

 In one specimen the first abdominal segment is all black and the 

 second has an entire slender yellow band. 



Female. — Length, about 8 mm. Face all black, except a small 

 mark mesad of each antenna, and a hardly noticeable line along orbits; 

 supraclypeal area coarsely punctured all over; narrow occipital band 

 extending about halfway down eyes; tarsi black; first abdominal 

 segment all black, second with a slender line on each side; segments 

 3 to 6 with yellow bands, 4 and 5 brown beyond the band; ventral 

 scopa white. The venation, v/ith the second recurrent nervure 

 going far beyond the second cubital cell, indicates that this rather 

 than D. undecimale is the female of D. clirysurum. The locality also 

 is the same as that of type D. clirysurum. 



Huachi, Beni, Bolivia, September (W. M. Mann). Described 

 from five specimens. 



Type and two paratypes. —Csit. No. 29080, U.S.N.M. 



Two para types in author's collection. 



DIANTHIDiUM QUADRIMACULATUM, new species 



Female (type).— Length, about 6 mm. Rather slender, black, with 

 pale yellov/ and ferruginous markings; pubescence extremely scanty, 

 dorsum nude, head and dorsum of thorax dull and extremely densely 

 and coarsely punctured, pleura shining between the punctures; eyes 

 pale lilac-gray; clypeus and supraclypeal area densely punctured all 

 over; clypeus with a round reddish-yellow spot at each extreme side; 

 rather broad pale orange bands along anterior orbits, not reaching 

 top of eye; occipital band reddish yellow, very narrowly interrupted 

 in middle, not going far below top of eye; scape clear ferruginous; 

 flagellum red beneath, dark above, third antennal joint red on both 

 sides; mesothorax dull, more than lateral third of its anterior margin 

 with a yellowish-red band; scutellum and axillae reddish orange, 

 except at base; tubercles with a red spot; a broad, coarsely wrin- 

 kled area (not at all biarcuate) at base of metathorax; tegulae clear 

 ferruginous; wings dilute fuliginous, apical margin paler; recurrent 



