168 
Yellow Scale parasite, Coccophagus citrinus Craw, that it unquestiona- 
bly belongs to the genus Hnecarsia rather than to Coccophagus and that 
the drawing is misleading, especially in the details of the thorax. — 
American Spiders.—We are greatly pleased to learn that Count Key- 
serling’s magnificent work ‘‘ Die Spinnen Amerikas” has not been 
interrupted by the lamented death of the author. The publishers, 
Messrs. Bauer & Raspe, of Nurnberg, after Count Keyserling’s death 
in April, 1889, turned over his manuscripts to Dr. Marx, of this Depart- 
ment, whose name appears as editor of Part 11. This part includes a 
consideration of Brazilian spiders, and treats of 240 species of 70 genera 
and 14 families. Vol. Iv is now in course of preparation by Dr. Marx. 
It will take up the Epeiride of North, Central, and South Amer- 
ica. For this volume Keyserling left descriptions and illustrations 
of over 200 species. Vol. I of the work was published in 1880, and 
treated of the Laterigradee, and Vol. 11 upon the Theridiide appeared 
in two parts in 1884 and 1885. 
WHEAT AND GRASS SAW-FLIES. 
By C. VY. RILEy and C. L. MARLATT. 
For a number of years past notes on certain Saw-flies, the larve of 
which feed on wheat and various meadow grasses have been aceumn- 
lating in the Division. A short note on a Saw-fly larva, which attacked 
wheat, was published in Bulletin No. 4 of this Division. The adult, 
however, of this species was not obtained and little was discovered of 
its habits and life-history except the fact mentioned of its feeding on 
wheat. A further reference to wheat Saw-flies occurs in the Report of 
the Entomologist for 1884, in which an account is given of the habits of 
certain Tenthredinid larve which were found to infest wheat near Bloom- 
ington, Ill., and afterwards at Oxford, Ind. The descriptions of two 
forms of larve are there given, but no adults were reared and the species 
were not determined. Since that time the habits and life-history of a 
number of species have been somewhat fully traced, while some addi- 
tional larve, of which no adults have yet been obtained have been 
studied. In view of the fact that little,ifanything, is known of the work 
of these insects and that they are liable at any time to assume impor- 
tance, we deem it advisable to put on record the facts already obtained. 
The EKuropean Corn Saw-fly (Cephus pygmeus) has lately been found 
in injurious numbers in several localities, and is treated of at length 
by Prof. Comstock in Bulletin No. 11, of the Cornell Experiment Sta- 
tion, and an article is published upon it in Vol. 1 of INSECT LIFE, 
page 286. The larva of a Cephus sp. has been found by Mr. Koebele, 
