4 PROCEEDINGS OF THE NATIONAL MUSEUM vol.71 



14. Legs black; females 15. 



Legs marked with yellow 17. 



15. Abdomeft with only segments 4 and 5 narrowly margined with pale yellow; 



wings almost hyaline, with very dark costal margin (Brazil) 



indescriptum (Dalla Torre). 



Segments 4 to 6 with yellow bands; clypeus with only two spots (an inter- 

 rupted band in indescriptum) nitidipes, new species. 



Segments 3 to 6 with broad yellow bands 16. 



16. Smaller; mesothorax more finely sculptured; two conspicuous yellow lines on 



front undecimale, new species. 



Larger; mesothorax more coarsely sculptured; yellow marks on front much 

 reduced (female) chrysurum, new species. 



17. Head mainly yellow (Venezuela) buyssoni (Perez). 



Head black marked with yellow 18. 



18. Lower half of male clypeus yellow chrysurum, new species. 



Male clypeus all yellow; female face black (Cayenne) bilineatum (Spinola). 



Margin of female clypeus and inner orbits broadly j^ellow 



H. beniense, new species. 



DIANTHIDIUM MA NNI, new species 



Female. — Length about or a little over 9 mm. Robust, black, the 

 head and thorax above with much glistening red hair, sides of face 

 and of thorax with a little white hair; face, mandibles, and antennae 

 black, the flagellum obscurely brownish beneath at base; occiput with 

 an interrupted clay-yellow band; thorax all black, tegulae black; 

 wings dilute fuliginous, with a darker streak in apical part of marginal 

 cell; second recurrent nervure going almost as far beyond second 

 cubital cell as first beyond first intercubitus; abdomen with first seg- 

 ment black, second with a yellow stripe at each side, third to sixth 

 with broad lemon-yellow bands; ventral scopa white; legs black, tai'si 

 hairy, middle tarsi stout; middle of supraclj^^peal area broadly, and 

 median band on clypeus, narrowing below, polished and impunctate; 

 front densely punctured, vertex shining between the large punctures; 

 mesothorax and scutellum very densely punctured and entirely dull; 

 cheeks shining, with a large raised keel behind; mcsopleura coarselj'' 

 punctured; mesothorax dull, the basal area a biarcuate band; basal 

 abdominal segments very minutely and denselj^ punctured ; hind coxae 

 elevated above. 



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

 one female. 



Type.— CAt. No. 29074, U.S.N.M. 



DIANTHIDIUM HOLMBERGI, new species 



Female. — Length 7.5 mm. Similar to D. manni in most respects, 

 but easily distinguished thus: Face densely and coarsely punctured, 

 with a narrow sm.ooth band on supraclypeal area; lower corners of 

 clypeus and inner orbits obscurely marked with reddish (or orange 

 altered by cj^anide); flagellum reddish brown beneath; occipital band 

 narrow but entire; cheeks not very broad, coarsely but irregularly 



