June 1895.] 



PSrCHE. 



ibb 



spines. Anal plales appearing cur\'ei.i, suis- 

 lunate, but on pressure flattening out to a 

 more triangular form, with the outer sides 

 meeting at less than a right angle. Ano- 

 genital ring with six hairs. The peculiar 

 plates, with the anogenital ring between, 

 are figured herewith, being difficult to 

 describe in a satisfactory manner. The 

 disposition ot the seven bristles on eacii 

 plate is to be noted; also the striae radiating 

 from the ring. 



Lic/itensia viburni (Liclit. MS.) 

 Signoret, 1S73, was until last year the 

 only known species of its genus. It 

 was fifst found at Montpellier, France, 

 but was recorded from England by Mr. 

 Douglas in 1SS7. I have received 

 specimens from Mr. R. Newstead, 

 which were found on ivy at Llandatf. 

 Wales, by Mr. B. Tomlin. Just 

 twenty years after the discovery of the 

 first species, I found at Vera Cruz, 

 Mexico, a most beatitiful species with 

 a yellow ovisac {Lichtensia liitea 

 Ckll.), which at the time of its descrip- 

 tion (Ann. Mag. N. H , July 1893) was 

 regarded as an aberrant Pulvinaria. 

 Subsequent studies showed that it must 

 be regarded as a Lichtensia, though 

 widely departing frorn the type of that 

 genus. 



Qtiite lately I have received yet 

 another species from Japan (coll. 

 Takahashi, com. L. O. Howard) 

 which will be elsewhere described as 

 Lichtensia ditbia. 



The genus thus appears to consist of 

 four species so far known, inhabiting 

 widely distant localities. It is by no 

 means certain, however, that we iiave 

 a natural genus, consisting of species 



derived from a common stock exhibit- 

 ing the generic characters. The 

 possibility cannot be forgotten, tliat 

 what we call Lichtensia merely com- 

 prises several independent derivatives 

 froin the general Pulvinaria stock, in 

 which case the peculiar distribution 

 need not cause surprise. 



L. lycii is from Las Cruces, N. M.. 

 3,800 feet alt. ; on a Lyclum which 

 Prof. E. O. Wooton informs me is 

 almost certainly Z. Torreyi, Gray. 



Cerococccs ehkhorni, sp. nov. 



J bright crimson, pjriforni. Antennae 

 minute, hardly longer than broad, jointless, 

 subtruncate, with about five stiff bristles at 

 the end. The antennae are about twice as 

 far from each other as from the edge of the 

 body, and about as far from each other 

 as from the mouth-parts. Mouth-parts 

 brow-nish. Caudal portion brown, cylindri- 

 cal, produced, divided a little before its mid- 

 dle into two conical processes, — the lobes, — 

 each bearing a few inconspicuous short but 

 stout spines. Anal ring between these 

 processes, with four (two pairs) of stoiit 

 spines. Derm with very small double pores. 



The females, no bigger than ordinary 

 females of Diaspis, are gregariously massed 

 on the bark in a hard dirty-white secretion, 

 the scales not being separable. On boiling 

 in soda, the insects turn the liquid brown. 



Hub. On live oak, Mountain View, 

 California, 1895 (coll. Ehrhorn). 



This singular insect ditlers from C. 

 qiierciis Comstock, the only Cero- 

 coccus hitherto known, by the shape 

 of the 9 1 t'le character of the anal ring 

 (if Comstock's figure is correct), the 

 shortness of the spines on caudal lobes, 

 and the totally diflerent external ap- 

 pearance. 



