3o6 TRANS. ST. I.OUIS ACAD. SCIENCE. 



Described from nine specimens bred in Missonri, June 21, 1876, 

 from Caccecia sefuiferana (Walk.) The delicate white cocoons 

 are spun together in a roll of a leaf. From Apanteles carpatus 

 ^Say) this species differs in its smaller size, shining thorax, and 

 smooth metathorax and abdomen. Microgaster clavatus Prov. 

 appears to be a synonym oi carpatus^ although Provancher's de- 

 scription is faulty in making no mention of sculpture. Among 

 a dozen carpatus bred in July I find some variation in the color 

 of the legs, in four of the specimens the legs being more or less 

 tinged with piceous. 



Apanteles alexia, n.sp. (Fig. i,a). — Length 2"""- c?$. Black; palpi 

 white, labrum, mandibles and basal joint of antennae piceo-testaceous, the 

 flagellum sometimes piceous. Legs light red, the posterior tibiae whitish 

 on the basal halt'; tips of posterior tibiae, the posterior coxae and tarsi, black 

 or blackish ; the posterior femora sometimes dusky. Abdomen testaceous 

 beneath, except along the median line and on the apical third; the edges 

 of the first joint testaceous. Wings hyaline, the tegulae, veins and stigma 

 ■white. Mesoscutum closely punctured, opake ; scutellum sparsely punc- 

 tured ; metathorax obliquely truncate, its posterior face with a median 

 subtrapezoidal or pentagonal area. Abdomen narrow, basal joint as long 

 as one-half of the remainder, rugose, its posterior border excavated in the 

 middle, remaining joints not sculptured and not highly polished. Ovi- 

 positor notexserted. Radial vein arising slightly beyond middle of stigma 

 and forming a curve with the basal vein of the areolet. This species 

 resembles Ap. hyaliuus Cress., described from Cuba, but difters in the 

 coloration of the legs and in the ovipositor not being thickened at the tip. 



Described from many specimens bred from the young larya of 

 Aletia argillacea., in Florida, by Mr. H. G. Hubbard, and in 

 Alabama by Mr. E. A. Schwarz and Mr. W. H. Patton. There 

 are several generations during the season, as it has been bred in 

 August, September and October from the different broods of the 

 Cotton-worm. The fly is disclosed about ten days after the 

 cocoon is formed. Mr. Schwarz observed that the larva of this 

 Microgaster is found only in the posterior part of the Aletia 

 larva. It is a solitary parasite, only one specimen infesting a 

 single Cotton-worm. The cocoon is formed, without conceal- 

 ment, upon the cotton-leaf, and was found quite commonly the past 

 season, although it had not been observed before. It measures 

 from 3 to 4 mm. in length, is of a white color, and is covered with 

 loose silk, this outer covering forming two characteristic tufts at 

 opposite ends of the cocoon and on opposite sides. The fly 



