142 THE MEXICAN COTTON-BOLL WEEVIL. 



Lariophagus texanus Crawford (PI. XVIII, a). — There is strong 

 evidence that this species is a primary parasite of the boll weevil in 

 southern Texas. It is also undoubtedly a parasite of four other 

 species of weevils. 



EULOPHID.E. 



Tetrastichus Tiunteri Crawford (PI. XVIII, b, c). — This parasite of 

 the boll weevil has been known only since 1908. It is the only 

 internal hymenopterous parasite of the weevil and occurs commonly 

 in Louisiana and Mississippi and has been recorded from Texas. It 

 is evidently more important in the fall of the year. 



ICHXEUMOXIDEA. ICHXELMOXID.E. 



Pimpla sp. — On February 23, 1909, a single female of this species 

 was reared from a weevil larva collected at Nacogdoches, Tex., on 

 January 27. 



BRACOXIDJE. 



Sigalphus curculionis Fitch. — This common parasite of the plum 

 curculio has been found frequently attacking the boll weevil in 

 Louisiana and Mississippi. It is known as a parasite of eight other 

 species of weevils. 



Urosigalplius anthonomi Crawford. — This species has been reared 

 from the boll weevil only at Brownsville, Tex. 



Urosigalplius schwarzi Crawford. — This species is a parasite of the 

 boll weevil in Guatemala and has never been reared in the United 

 States. 



Urosigalplius sp. — A single specimen of this species was reared in 

 1909 at Arlington, Tex. 



Microbracon mellitor Say.— Until 1909 this was the most important 

 parasite of the boll weevil. It is coextensive in distribution with its 

 host, but is by far most important in Texas and Oklahoma. It is 

 known as a parasite of 10 other species of weevils. 



An unknown braconid, nearly related to Glyptocolastes, was reared 

 from the boll weevil in southern Texas. 



DIPTERA. PHORID.E. 



Aplxiochsda nigriceps Loew. 



Aphiochseta fasciata Fallen. 



Apliiocliseta pygmsea Zetterstedt. 



These three species and also possibly others in this genus have fre- 

 quently been found feeding upon boll-weevil larvae and in many cases 

 under such circumstances that they must be assumed to be parasites 

 as well as scavengers. 



TACHIXID.E. 



Myiophasia senea Wiedemann. — This fly has been recorded as a 

 parasite of the boll weevil in Texas. It is also an enemy of six other 

 species of weevils. 



Ennyomma globosa Townsend (PI. XVIII, d, e). — This fly is an 

 important parasite of the boll weevil in Louisiana. It also attacks 

 the cowpea curculio. 



