20 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



squares. It is of interest to note that a mite of this genus (Erio- 

 phyes gossypii) attacks cotton in Montserrat, St. Vincent, and St. 

 Lucia of the West Indies. 



LEAF GALL. 



A species of Itonididse (Cecidomyiidae) is very common upon the 

 plants in Stone Cabin Canyon. This insect oviposits in the midribs 

 of the tiny leaves causing the leaves to form a sort of pocket-gall, but 

 not preventing the leaf from completing its growth somewhat de- 

 formed. Within the walls of this gall the larva feeds. We have no 

 I tonidid enemies of cotton in the United States but in the West 

 Indies, Contannia gossypii does considerable damage. 



MEALY BUG. 



A species of mealy bug (Pseudococcus sp.~) was found on Thur- 

 beria near McCleary's Ranch in Stone Cabin Canyon on August 

 25. Between 20 and 25 specimens in all were collected and ob- 

 served including two specimens of adult females. These insects 

 were in most instances found inside rolls of the leaves evidently 

 produced by the Itonidid maggots which are mentioned above. 

 One of the full grown female specimens confined in a box without 

 food gave birth to between fifteen and twenty larvse within twelve 

 hours. The two adults and several specimens one-half to three- 

 fourths grown were kept in vials and fed upon Thurberia squares 

 hoping to breed a sufficient supply for study. Later (after Sep- 

 tember 3) the insects were fed on Egyptian cotton squares at 

 Phrenix. In all about fifty specimens were cared for but notwith- 

 standing daily attention no more adults were bred and the mature 

 females soon died. 



It is suspected that the wild cotton mealy bug is the same as 

 that found on Gcertnena xanthocarpa in Pima Canyon on August 23 

 and that the same species was found on Thurberia in Ventana 

 Canyon on August 31. On October 1, Mr. 0. C. Bartlett was un- 

 able to find any additional specimens on wild cotton in Ventana 

 Canyon. 



The following notes were made concerning the adult specimens : 

 Length 5.5 mm., width 3 mm., color shining dark gray. Short 

 marginal ribbons of wax increasing slightly in length, posteriorly. 

 No conspicuous marginal spines. Newly born larvse quiescent 

 with wax filaments from the body of the adult among them making 

 a loose cottony mass. 



In one vial containing an adult female and larva mass a dipter- 

 ous pupa appeared. This was bred out and proved to be a species 

 of Leucopis. 



Mr. Coad was able to carry this mealy bug on cotton leaves at 

 Victoria for a month. 



