so 
PSYCHE 
[August 
Mixogastj:r breviventris Kahl. 
M. brevii'entris Kalil, Kansas Univ. (^uart., VI, p. 137, 1S07. 
A male and female of this interesting s])eeies were collected bv Mr. Erich Daecke, 
at Luca.ston, N. ,T., August 27, 1005. The type, a female, was descrihed from Law- 
rence, Kans. The male dilfer.s hut little from the female c.xcept that the fourth 
segment is nearly twice the length of the third, the posterior border on both being 
greatly dilated towards the lateral margins; the fifth segment and hypopygium (in 
the specimen before me) seem to be injured or forced within the abdomen, so that 
they cannot be accurately described. 
rmCHOGRAMMA PRETIOSA RILEY: SEA.SONAL HISTORY. 
BY .\. GIR.AULT, W.ASm.VGTOX, D. C. 
The paper here pre.sented for publication is one of a series on this in.sect based 
on observations and stiulies made during the Cotton Bollworm Inve.stigations in Texas 
in 1904, by the U. 8. Department of Agriculture. The observations were made in 
the laboratory at Paris, latitude 33°, 45' north and the ho.st of the parasite was Helio- 
ihis obsoleki Fabricius, unless othervvi.se .stated in the text. In their rej)ort on the 
bollworm, (^uaintance and Brues (1905) have already given the siibstance of much 
that is to follow, but I believe the observations of enough importance to justify elabora- 
tion, an impossibility in connection with an economic report of that kiml. 
Number of Generations. 
The species under consideration is a remarkable examjile of an hymenopteroiis 
in.sect having multiple generations, and to this fact may be largely attributed its 
efficiency as a parasite. From the Iveginning to the end of the breeding season of 
1904, it was under constant ob.servation, and in the laboratory many successive 
generations were breil, so that actual records were olitained for fifteen consecutive 
cycles from the latter part of May to the first week in November. In addition to 
this direct evidence, there was also obtained much supplemeutary data, which war- 
rants a positive .statement to the effect that there were at lea.st eighteen di.stinct gener- 
ations of the little egg-parasite in the vicinity of Paris in 1904. The records show 
that the parasites began to ajipear about May 3rd, corresponding to the first noticeable 
