ENTOMOLOGY. 



071 



A comparison is made with the lobes of A. ancylus, hoicardi, ostrece- 

 formiSj juglans-regice, albopunctatus, obscurus, and crctwii. The differ- 

 ences in the ventral glands are brought out in the following table: 



Ventral glands of the species of Aspidiotus, 



A . pemiciosus 



A. andromelas 



.1 . rapax 



.1 .juglans-regice 



A.forbesi 



A. ostreceformis (from England) . . 



. 1 . eon vexus 



.1 . illli-filus 



.1 . eydonice 



A. crawii 



A. uvce (on grapevine) 



A.obtcurus 



A. kowardi 



A.patavinus (on cherry in Italy) 



Median Cephalo- Cando- 

 ' laterals, laterals. 



None. 



N'one. 

 None. 



to 4 



1 to 3 



6 

 Xone. 

 to (i 

 None. 



NllllC. 



to 2 







N - 



to 2 



None. 



None. 



None. 



7 to 16 



3 to 7 



11 



7 



6 to 14 



- to 9 



5 



4 to 9 



12 

 6 to 7 

 4 to 9 



None. 



None. 



Xone. 

 4 to 8 

 3 to 



5 to 



:; to 4 

 7 to 10 



Comstock's division of the genus Aspidiotus into subgenera is com- 

 mented upon and the various subgenera are considered at some length. 

 Melanaspis (type A. obscurus), Myeetaspis (type A. personatus), Pseu- 

 daonidise (type A. duplex), Cryptophyllaspis (type A. occultus), Selenas- 

 pidus (type A. articulatus), and Xerophilaspis (type A. prosopidis) are 

 suggested as new subgenera. 



The author endeavors to prove that the San Jose" scale is a native of 

 Japan, upon the ground that 2 varieties or subspecies of A. pemiciosus, 

 namely, andromelas and albopunctatus, occur in that country which agree 

 almost exactly in structural details with A. pemiciosus. The question 

 of origin is discussed at considerable length.. The older idea of the 

 Chilean origin of A. pemiciosus, as well as the Australian origin, is more 

 or less summarily dismissed, and the observation made that the supposed 

 variety of A. pemiciosus, found by Maskel on Eucalyptus in Australia, 

 is not correct. The species of A. diaspidiotus of the United States are 

 not thought very closely related to those of Europe. The American 

 species differ in the median lobes being nearer and more inclined to be 

 notched. The author notes a tendency in the American species to give 

 off a group with pallid and usually flatter scales, which are found in 

 the peripheral parts of trees, leaves, and even fruit. By this means he 

 draws A. howardi from A. ancylus. A. juglans-regice is considered a very 

 distinct form, suggesting in its scale A. chrysomphalus. 



Under the head of habits of the species it is pointed out that A. 

 pemiciosus is partial to the Rosacese, as supported by the following 

 list of host plants upou which it has been found: Apple, crab apple, 

 quince, pear, Bartlett pear, dwarf Duchess pear, plum, Japan plum, 

 Satsuma plum, Primus pissardi, P. maritima, peach, apricot, almond, 

 cherry, Rocky Mountain dwarf cherry, currant, black currant. Citrus 

 trifoliata (Albopunctatus), osage orange, grape, elm, cottonwood, Euro- 

 pean linden, American chestnut, Pyrus japonica, Catalpa bignonioides, 



