NATURAL ENEMIES: PARASITIC [NSECTS. 
143 
U. S. Dept. Agr., p. 17). The insect was reared from the cotton boll 
weevil (Anthonornus grandis) at Calvert. Tex., and is doubtfully 
recorded from Oonotrachdus juglandis Tec Specimens of curcuVu 
were also received from Prof. A. H. Conradi, Clemson College, S. C, 
in 1908, and from Prof. Fred E. Brooks, Morgantown, W. Va., Jan- 
uary, 1907, who had reared them from Balaninus sp. As stated by 
Mr. W. D. Pierce (Journ. Econ. Ent., vol. 1, p. 386), it com- 
monly attacks Conotrachdus elegans Boh., at Dallas and Victoria, 
Tex. At Four Mile Run, Va., it was reared from Trichobaris trinotata 
Say in eggplant. Riley records the Sigalphus from a stalk-borer 
in Ambrosia (Ins. Life, vol. 2, p. 353). In West Virginia it has been 
reared in abundance from Conotrachdus affinis Boh. and in lesser 
numbers from C. juglandis Lee. (W. Va. Agr. Exp. Sta., Bui. 128. 
p. 182). 
This, so far as the writers know, is the complete host list of the 
species, and Sigalphus is so much more common on Conotrachdus 
nenuphar that this is without doubt its principal host. 
(Sigalphus) Trias pis curculionis is of general occurrence througn- 
out eastern Xorth America, its range probably being coextensive 
with that of the plum curculio. A list of localities, with dates of 
rearing, is given in Table LXXXI. 
Table LXXXI. — Distribution of ■sigalphus* Triaspis curculionis. with dates of 
rearing. 
Localities. 
Dates of emergence. 
Localities. 
Dates of emergence. 
New Haven. Conn 
July 12-18, 1005. 
JulV 14-Aug. 18, 1905. 
July ^14. 1906. 
June 24-Julv 12, 1907. 
Julv 21, 1905. 
July is, 1905. 
June 21-Julv 2G, 1905. 
June 16-Julv 6, 1905. 
May 22-July 17, 1905. 
June 24-Julv 30. 1908. 
June 2-Julv 30. 1905. 
June 15-17, 1905. 
June 20, 1905. 
Do. 
Fort Vallev, Ga 
j Myrtle, Ga. 
May 22-July 3, 1905. 
June 10. 1906- 
North East, Pa 
New Richmond, Ohio.. 
Barnesville. Ga 
i Lake City, Fla 
Mav 23-June 30, 1910. 
May 23, 1905. 
East Lansing, Mich 
Valparaiso, Ind 
Arundel, Md 
Riverdalo. Md 
Washington, D. (' 
Do 
Hampton, Fla 
May 31, 1905. 
June 15, 1905. 
Mexia, Tex 
Siloam Springs, Ark. . . 
Bentonville, Ark 
June 18 
June3-Julv 18, 19 8 
June 24-26, 1906. 
June 21-Julv 8, 1905. 
Arlington, Va 
Salina. Kans 
Julv 22, 1910. 
Winchester, Va 
Raleigh, X. C 
Tryon, X. C 
Grand Island, Xebr 
Xorth Platte, Xebr 
Julv 18-22, 1910. 
Do.- 
Localities in literature: 
St. Catherines, Ontario (Fitch). 
St. Louis, Mo. (Riley). 
Ames, Iowa (Gillette). 
The insect has been reared from many localities during the past 
four or five years, exclusively from plum curculio larvae, but never 
in noteworthy numbers, although the degree of parasitism in a few- 
cases reached 25 per cent. This would vary, perhaps, depending 
upon when the infested fruits were collected, as larvae are parasitized 
principally in early spring. In three records that covered the entire 
season the average infestation was 2.78 per cent. 
In connection with the records of emergence o( larvae from fruit 
for the season in the insectary yard and other data ^see p. 62), ac- 
