146 



usually attack dipterous larvae in galls, and a number of specimens 

 of a species of Ooencyrtus ma}^ have been parasitic upon the eggs of 

 some lepidopteron or hemipteron, but certainly could not have reached 

 the eggs of the weevil. 



It is very noticeable that the dried squares which were picked from 

 the plants produced by far the largest part of all the parasites obtained, 

 342 squares giving 50 parasites. In this lot, therefore, 14 per cent of 

 the total number contained parasites of some kind and 13 per cent 

 were undoubtedly developed from the weevil larvae. Taking all other 

 squares together, 5,286 5delded only 18 primar}^ parasites, or only 0.3 

 per cent. 



Previous efforts to breed parasites of the weevil yielded as meager 

 results as those which have just been recorded, though they add to the 

 number of species. In 1894 Prof. C. H. T. Townsend bred, at Corpus 

 Christi, Tex., a single specimen of Urosigaljyhiis robastus Ashm., which 

 was in all probability a primary parasite, as was also Bracon dorsata 

 Say, of which Mr. Schwarz obtained two specimens at Goliad, Tex., 

 in the fall of 1895. A specimen of Eurytoraa tylodermatis Ashm. , also 

 reared by Mr. Townsend, may possibl}^ have had some other host. 



Prof. A. L. Herrera has bred from weevils in the State of 

 Coahuila,. Mexico, a new species of uarasitey described by Dr. W. H. 



Ashmead as Brucliojpliagus 

 Jierrerae. 



Pediciiloides veiitricosus 

 Newp. — This small mite has 

 been thought by some scien^ 

 tists to be the most promising 

 parasite yet found attacking 

 the weevil. It has been ex- 

 perimented with quite exten- 

 sively by Prof. A. L. Herrera 

 and his assistants of the Mexi- 

 can Commission of Parasitol- 

 ogy. The mites breed with 

 extreme rapidity, the larvae 

 of wasps being their usual 

 hosts (PI. XX, fig. 85). Both 

 sexes attain full physical and 

 sexaal maturity while yet 

 within the body of the moth- 

 er. The males are exceed- 

 ingly tiny, as are also the females, when they first leave the mother 

 mite. As the females become gravid, however, their abdomens swell 

 to an astonishing size as compared with the rest of the body, being 

 distended by the rapid growth of the young mites (fig. 7). When 



Fig. 7.— Enemy of cotton boll weevil, Pediculoides ven- 

 tncosus— much enlarged (adapted from Brucker). 



