116 



ATIDM. 



white pubescence on its apical margin laterally ; beneath, the third 

 and fourth segments fringed with white pubescence laterally, the 

 fifth entirely fringed ; the margins of the segments rufo-piceous. 



Hab. Brazil, Santarem. 



9. Melissodes ambigua. 



Female. Length 4 lines. — Black. The face with griseous pubes- 

 cence ; the flagellum, except two or three of the basal joints, ful- 

 vous beneath; the clypeus strongly punctured. Thorax with 

 griseous pubescence above, that on the disk of the mesothorax and 

 on the scutellum black ; beneath and on the legs it is black, excep t 

 that on the posterior tibise and first joint of the tarsi, which is ful - 

 vous ; wings subhy aline. Abdomen closely and finely puncture d 

 at the base of the segments, the base with a little griseous pube s- 

 cence ; the second segment with a narrow white pubescent fasc ia 

 at the basal margin, also an interrupted one in the middle of the seg- 

 ment, the third with a narrow white fascia at the base, the fourth 

 with a broader fascia ; the two following with black pubescence ; 

 the segments beneath fringed with black pubescence. 



Hab. Mexico. 



10. Melissodes hirsuta. 



Male. Length 4^ lines. — Black, with fulvous pubescence. The 

 clypeus and labrum yellow : the mandibles ferruginous, with their 

 base black ; the flagellum, except the basal joint, fulvous beneath ; 

 the pubescence on the head pale fulvous. The thorax with bright 

 fulvous pubescence above; on the metathorax, the sides, and 

 beneath pale fulvous ; wings hyaline, their apical margins slightly 

 clouded, the nervures ferruginous ; the legs with pale fulvous pu- 

 bescence, the tarsi ferruginous, the basal joint more or less fuscous 

 outside. Abdomen very pubescent ; the segments with broad fasciae 

 of fulvous pubescence, which is rather long and dense ; the apical 

 segments beneath fringed with fulvous pubescence. 



Hab. Mexico, Oajaca. 



PACHYMELUS. 



Head not quite as wide as the thorax ; antenna; slender, the fla- 

 gellum filiform ; the clypeus convex ; the mentum rounded ante- 

 riorly ; ocelli in a triangle ; mandibles arcuate, rounded at the apex, 

 not toothed. The labial palpi 4-jointed ; the first joint elongate, one 

 third longer than the mentum ; the second joint about one fifth of 

 the length of the first joint ; the two apical joints minute, inserted 



