30 PROCEEDINGS OF THE NATIONAI. MUSEUM, vou 63. 



76. Females 77. 



Males 85. 



77. Flagellum attenuate, all of the joints considerably longer than wide 78. 



Ninth antennal joint never very distinctly longer than wide; flagellum stouter, 



not so attenuate 80. 



78. Scutellum transverse, more or less flattened; fourth antennal joint in male hardly 



wider apically than the pedicel 64. antennariae (Ashmead). 



Scutellum highly convex 79. 



79. Scutellum transverse, very high, abdomen in female not or but little longer than 



the head and thorax united; fourth antennal joint in male about as wide at the 



ajjex as the pedicel 65. pint, new species. 



Scutellum circular, not so highly elevated; abdomen in female considerably 

 longer than the head and thorax united ; fourth antennal joint in male distinctly 

 wider at the apex than the pedicel 66. rohweri, new species. 



80. Abdomen not more than twice as long as wide 81. 



Abdomen distinctly more than twice as long as wide 82. 



81. Reflexed margin of abdomen broad, usually horizontal, nearly half as wide as the 



swollen surfaces of the sternites between them 67. huachucae (Ashmead). 



Reflexed margims of abdomen not so broad, usually sloping steeply inwardly. 



68. astericola (Ashmead). 



82. Abdomen not longer than the head and thorax united 83. 



Abdomen distinctly longer than the head and thorax united 84. 



83. Foveal striae on second tergite extending beyond the middle of the segment. 



69. rubi (Ashmead). 

 Foveal striae not extending beyond the middle of the segment. 



70. relativa, new species. 



84. Antennae and legs brownish or brownish yellow 71. vernoniae (Ashmead.) 



Antennae piceous; legs dark brown to blackish 72. variabilis, new species. 



85. Fourth antennal joint more or less emarginate basally and considerably widened 



apically 86. 



Fourth antennal joint not distinctly emarginate basally and not especially 

 widened apically 88. 



86. Flagellum elongate, all the joints considerably longer than wide. 



64. antennariae (Ashmead). 



Flagellum shorter and stouter, none of the joints, except the last, much longer 



than wide 87. 



87. Abdomen about twice as long as wide 71. vernoniae (Ashmead). 



Abdomen less than twice as long as wide 67. huachucae (Ashmead) . 



88. Fourth antennal joint distinctly thicker than the pedicel. 



72. variabilis, new species. 

 Fourth antennal joint not distinctly thicker than the pedicel. 



68. astericola (Ashman). 



1. PLATYGASTER APHIDIS Ashmead. 



Platygaster aphidis, Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 325. — Brues> 

 Bull. 22, Conn. Geol. Nat. Hist. Survey, 1916 0917), p. 541. 



Male. — Length 1.6 mm. Head posteriorly almost smooth, not 

 distinctly punctate ; frons polished ; antennae ten-jointed, black; pedi- 

 cel as long as the first and second funiclar joints together, the first 

 joint small, subtriangular, closely united to the second, the second 

 somewhat swollen and slightly twisted; club six-jointed, the joints 



