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 tlie young alive, as the winter form of 

 this species did, tl:e summer females deposit eggs with the tloccose 

 covering the same as 1). destructor does. 



As this species appears to be without a name, it perhaps would be 

 well to term it Dactyloplm trifoUi* for convenience in comparing the 

 tbrms with those of the other species given. The female of trifoUi in 

 general appearance and structure resembles that of destructor. She is 

 smaller and the seventeen waxy fHaihents 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 autennal segments and the comparative length of the tibiae and 

 tarsi seem to be stable characters of considerable value. In trifoUi the 

 tarsus is nearly as long as the tibia and the claw well developed; in 

 lonffijilis 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 

 antennjTB of trifoUi 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 haiiid 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 relativ^e length of the different segments, beginning at 

 the base. The measurements are made by using the micrometer. 



In trifolii the terminal segments at the tip are quite truncate, in 

 destructor considerably less so, and in longifiUs tapering to a point. 



* Under date of October 10, Mr. DaTis writes that he has found this insect to be 

 synonymous with Coccus trifolii Forbes. — L. O. H. 



