NO. 3533 CHALCID WASPS OF GENUS EURYTOMA — BUGBEE 495 



It may be distinguished from E. pini by the broad dorsal valves of 

 the female genitalia; the narrower, more deeply depressed propodeum; 

 lack of brown infuscation on the yellowish tibiae; and the shorter but 

 equal lengths of the marginal and postmarginal veins. 



The importance of this parasite in reducing the number of the 

 boll weevils is considerable. Fenton and Dunnam (loc. cit.) found it 

 third in importance to Microbracon melUtor (Say) and Catolaccus 

 hunteri Crawford, at Florence, S.C. Pierce (1910) believes that it 

 occurs most often as a primary, ectoparasite of the larvae of A. 

 grandis. He also believed (Pierce 1908a) that this species, which he 

 knew as E. tylodermatis, had several alternate hosts including Lixus 

 scrohicollis m the stems of Ambrosia trifida. In several ways this 

 species is close to E. tylodermatis which has been bred from L. scrobi- 

 collis, but the characteristics listed above wUl separate them. L. 

 scrobicollis is a native weevil while the cotton-boll weevil was intro- 

 duced from Central America, and it seems to be almost exclusively 

 confined to cotton as its host. Furthermore, the weevil passes 

 through 3 to 5 generations a year thus providing ample stages for the 

 parasite to oviposite on, and a need for alternate hosts seems quite 

 unlilvely. 



The sex ratio favors the females, as Pierce (1908b) found the per- 

 centage of males in his rearmgs to be 35.4%. Pierce, Cushman, and 

 Hood (1912) report a sex ratio of 64.9% females to 35.1% males. 



60. Eurytonia squamosa, new species 



Figure 20; Map 27 



Female: Mostly black. Averages 2.2 mm. (2.0-2.6) in length. 

 Abdomen oval from a lateral view and quite plump; averaging 1.1 mm. 

 (1.0-1.3) in length; terga two through eight heavily sculptured 

 laterally, becoming lighter over dorsal surface; sixth tergum, laterally 

 and dorsally as long or longer than four and five combined; ninth 

 tergum short and stubby, averaging .08 mm. (.07-.10) m length. 

 Internal genitalia short and widely spread; average 1.3 mm. (1.2-1.5) 

 in length and .65 mm. (.57-.75) in height; thus the height is equal to 

 half the length; dorsal valves broad for horizontal length and black; 

 dorsal and ventral valves turn dorsaUy, anteriorly, only slightly at 

 much less than a right angle; stylet arch in a horizontal plane, Pro- 

 podeum concavity broad, wide and shallow; median furrow mdicated 

 dorsally by barely discernible lateral carinae that converge and fade 

 out entirely about the middle of propodeum; area below median 

 furrow and lateral areas finely and evenly punctate with a few fine 

 horizontal ridges among punctations. Tegula dark brown to black. 

 Scape of antenna black or yellow; pedicle not less than three-quarters 

 the length of the first funicle joint, that is, slightly longer than wide; 



