110 PROCEEUIXGS OF THE NATIONAL MUSEUM. vol.63. 



them in their descriptions or have not recognized them. Foerster 

 in his diagnosis of the group contents himself with saying in regard 

 to the male: " Das Mannchen zeichnet sich dadurch aus, dass das erste 

 Geisselglied sehr klein und mit dem zweiten innig verwachsen ist, die 

 Geissel also wirklich unter der scharfsten Loupe nur siebengliedrig 

 erscheint." Foerster described this character from specimens reared 

 from Cecidornyia pisi.^° 



Keiffer says of the male^^ in his description of Sactogaster miUefolii: 



Chez le mdle, les articles 3 et 5 sont petits, guere plus longs que gros, le 3* obconique, 

 le 4* le plus gros de tous, deux fois aussi gros et deux fois aussi long que le 3^, forte- 

 ment convexe dorsalement, droit ventralement, 6* a peine plus long et plus gros que le 

 5", 7-10 grossis et formant la massue, a piene plus long que gros, avec un petiole un 

 peu transversal, ii polls aussi long que le tiers de I'epaisseur des articles, 7-9 sub- 

 cylindriques, ayant de chaque cote, pres de Textremite, une lamelle hyalines. 



Species belonging to Sactogaster have been referred to Platygaster 

 ( by Walker ) and to Synopeas (by Thomson ) . The species whose 

 habits are known are parasitic on Cecidomyids. 



TABLE TO SPECIES. 



1. Last tergite three or more times longer than wide 2. 



Last tergite not more than twice as long as wide 1. anomaliventris Ashmead 



2. Sixth tergite about three times as long as \7ide; third tergite slightly grooved or 



striate in the anterior angles 2. longiventris, new species. 



Sixth tergite five or more times longer than wide 3. 



3. Sixth tergite about five times as long as wide; third tergite strongly shagreened. 



3. howardi Ashmead. 



Sixth tergite a little over six times as long as wide; third tergite longitudinally 



striate in a band which widens on the side 4. mucronata, new speciee. 



1. SACTOGASTER ANOMALIVENTRIS Ashmead. 



Sactogaster anomaliventris Ashmead, Can. Ent., vol. 19, 1887, p. 130, female. — 

 Cresson, Synopsis of Hymenoptera, p. 249. — Ashmead, Bull. 45, U. S. 

 Nat. Mus., 1893, p. 285. 



Female. — Length 1 mm. Head twice as wide as long, wider than 

 the thorax, shagreened or finely reticulate all over, more coarsely so 

 posteriorly; vertex separated from the occiput by a low rounded 

 ridge; thoracic ratio, length 18, width 13, height 14; notauli distinct, 

 not quite reaching the anterior margin of the mesonotum; scutellum 

 broadly transverse, covered with short white hairs; spine short, di- 

 rected backward and slightly upward ; abdomen one and one-half times 

 as long as the head and thorax united; tail as long as the second 

 sternite; second tergite considerably narrower than the thorax, 

 polished, as long as the thorax is wide (0.29 mm.); third tergite very 

 narrow, transverse, polished; fourth tergite shagreened in a broad 

 band across its median line, more than twice as long as the third, 

 about twice as wide as long; fifth a little longer, quadrate, shagreened 



"Hym. Stud., Heft 2, 1856, p. 113. »i Broteria, Serie Zool., fasc. 13 .vol. 11 1913, p. 194. 



