106 
trifolii agree essentially as regards the time from birth to maturity, 
the bearing period, and the length of life, the number of generations 
being essentially the same in both species. C. trifolii produces, how- 
ever, only half as many young per day as M. pisi (3.7 young as against 
6), and this difference serves to account for the relatively smaller num- 
bers of C. trifolii in the field compared with M. pisi. 
Wintered eggs hatched March 27, 28, and 29, according to our 
notes. 
On red clover, brought into the laboratory in November, and 
grown, there were found, January 29, a large number of the 
orange oviparous females, which laid eggs in profusion. The average 
number of eggs in the abdomen of the mother is ten, as found by J. J. 
Davis. 
The fungus Einpusa aphidis attacks this plant-louse thruout the 
season, in damp weather, just as it does M. pisi; and many of the in- 
sect enemies of the latter species attack C. trifolii also. 
Callipteriis trifolii maintains its existence every year, but has 
always been a sporadic species. 
Calliptcrus trifolii Monell. 
1882. Monell, ]. T.— Can. Ent., Vol. XIV., p. 14. 
1908. Davis, J. J.— Ann. Ent. Soc. Amer., Vol. I., pp. 256-258. 
Clover Stem-borer 
Languria mozardi Latr. 
The stem-borer is of but secondary importance among the in- 
jurious insects of clover; it has never been a pest, so far as I can 
learn. 
The slender yellow larva eats out the pith of the clover stem, 
making a long burrow, with brown discolored walls. The entire de- 
velopment takes place within the clover stem, and the adults fly abroad 
as slender beetles with dark blue wing-covers, and red thorax and 
head. 
Tho the beetle is well known to collectors, scarcely anything has 
been published on its life history since Comstock's brief account in 
1880. 
Distrihution. — This species was originally described from North 
America, and the genus Languria does not appear in the catalogs of 
European beetles. In this country L. mozardi has been reported from 
Pennsylvania, the District of Columbia, Indiana, Illinois, Michigan, 
Kansas, Nebraska, and elsewhere. Generally speaking, it inhabits the 
middle and the southern states, some of the western states, and parts 
of Canada. 
Food Plants and Injuries. — The clover stem-borer is by no means 
limited to red clover and mammoth clover, but feeds also on the fol- 
lowing plants, as C. M. Weed, Chittenden, and Webster found : wild 
