172 
I have often found them on thrifty roots uninjured by the little root 
borer. They always remain below the surface of the ground, except 
the male, which often comes above to pupate on the green stems and 
leaves. Instead of producing the young alive, as the winter form of 
this species did, the summer females deposit eggs with the floccose 
covering the same as D. destructor does. 
As this species appears to be without a name, it perhaps would be 
well to term it Dactylopius trifolii* for convenience in comparing the 
forms with those of the other species given. The female of trifolii in 
general appearance and structure resembles that of destructor. She is 
smaller and the seventeen waxy filaments around the margin are longer, 
particularly the anal ones, which are sometimes more than half as long 
as the body. With her mealy covering dissolved by chloroform she is 
of a deep brownish red color with dirty yellowish legs; the other two 
species are a brownish yellow. The anal cavity is also deeper than in 
either of the others, being the least so in longifilis. In the quite large 
series of specimens of the different species studied, the form and length 
of the antenna! segments and the comparative length of the tibise and 
tarsi seem to be stable characters of considerable value. In trifolii the 
tarsus is nearly as long as the tibia and the claw well developed; in 
longifilis the tibia is slightly longer and the tarsal claw is shorter; in 
destructor the tibia is twice the length of the tarsus and the claw is 
small. The four digitules are about the same in all three species. The 
antennae of trifolii are distinct from the other two in that the first two 
segments are thicker than any of the others, which is even more char- 
acteristic in the male, where they are nearly as broad as long. Segments 
7 and 8 of the female are also slightly thickened; 3, 4, 5, and 6 narrowest 
and of equal thickness. In destructor the basal and terminal segments 
are of equal width and broader than the others. Longifilis has the 
eighth segment the broadest, the others subequal. The following table 
will show the relative length of the different segments, beginning at 
the base. The measurements are made by using the micrometer. 
Number of segment. 
Length of segment. 
D. trifolii. 
D. trifolii 
(winter form). 
D. destructor. 
D. longifilis. 
1 > 
3.25 
3.5 
4. 75 
2.5 
3 
2.5 
3.5 
7 . 
2 
2.5 
3 
2 
3 
2 
2 
4 
3.5 
5 
5 
3 
4. 25 
3. 25 
4.5 
10 
3 
7 
5.75 
4 
5.5 
4. 25 
4.75 
11.5 
2 
3 
4 
5 
6 
7 
8 
Total 
30 
20.5 
38. 5 45. 75 
In trifolii the terminal segments at the tip are quite truncate, in 
destructor considerably less so, and in longifilis tapering to a point. 
* Under date of October 10, Mr. Davis writes that he has found this insect to be 
synonymous with Coccus trifolii Forbes. — L. O. H. 
