Vol. xxii] EXTOMOLOGICAL NEWS 217 



A new Coccid on Ledum (Hemip.). 



By T. D. a. Cockerell, Boulder, Colorado. 



I have just received from Dr. E. P. Felt a small Dactylopiine 

 Coccid collected on small twigs of Ledum groenlandicnm (fam. 

 Ericaceae) at Sand Lake, N. Y., July 14, 1910. To my aston- 

 ishment, it proves to belong to that section of Pseiidococcus 

 represented by the widely-spread tropical P. iilamentosns 

 (Ckll.) and P. hymcnocleae (Ckll.) of the Arizona desert 

 country. Ledum groenhandicum, according to Britton, occurs 

 from Greenland to British Columbia, Massachusetts, New Jer- 

 sey and Wisconsin. Pseiidococcus ledi is very much like P. 

 filamentosus, but differs in various details ; the most noticeable 

 peculiarity is the hump near the base of the tibia on the outer 

 side. The legs and antennae are very short and stout. The 

 microscopic measurements are in microns. 



Pseudococcus ledi n. sp. 



9 . — Length about 2 mm., broad oval, densely covered with mealy 

 secretion, which is strongly tinged with pale yellow ; on boiling in 

 caustic potash the insect appears dark blue-green, but the skin is 

 colorless and transparent ; antennae and legs very pale brown ; an- 

 tennae short and stout, first joint very large, last joint with both hairs 

 and curved spines, as in the genus Rhizoeciis (cf. Newstead, British 

 Coccidae, vol. 2, pi. LXIX. f. 8) ; antennae 7-jointed, the joints measur- 

 ing (i.) about 50 long, (2.) about 28 long and 30 wide, (3.) 25 long, 

 (4.) 25 long, (5.) 20 long, (6.) 25 long, (7.) 63 long and 23 wide; ter- 

 minal hairs of seventh joint about 28 long; so-called mentum dimerous, 

 not elongated, about 120 long and 85 wide at base, its bristles very 

 small; anal ring with six stout bristles, about 158 long; caudal lobes 

 low, with bristles little longer than those of anal ring, and the usual 

 round glands and short spine-like structures ; legs very short and 

 stout, claw stout, with a rudimentary denticle or protuberance near the 

 base, not always evident ; claw digitules well knobbed ; femur with 

 trochanter about 163; tibia about 75, humped near base; tarsus (ex- 

 cluding claw) about 53 ; width of femur 53. 



Mr. Roland TrimEn, F. R. S., well-known for his work on South 

 African Lepidoptera was recently the recipient of the Darwin Medal 

 of the Royal Society of London. 



