THE CANADIAN ENTOMOLOGIST. 227 



A NEW GOOSEBERRY PLANT-LOUSE. 



BY W. P. AND T. D. A. COCKERELL. 



Myzus Neom&xicanus, n. sp. — Winged form. General colour of head 

 and thorax black ; prothorax sage-green with a transverse black shield, 

 narrowest in the middle ; sides of thorax green ; antennae black ; wings 

 clear, stigma and nervures very dark brown ; abdomen sage-green, four 

 quadrate black marks on each side anterior to honey-tubes, the last some- 

 times a mere speck ; honey-tubes blackish, darkest basally ; segment 

 bearing honey-tubes with a few black spots, this and the following two 

 segments with transverse black bands ; legs black, tibiae brown. 

 Ocelliferous tubercle prominent ; frontal tubercles low and broad, these 

 and first antennal joint very slightly gibbous. Honey-tubes not swollen, 

 300 ji long and 40 broad, 200 //. short of tip of abdomen, cinguiate. 

 Body about 2100/x long, antennae about 1030, half length of body. 

 Tibia of anterior leg 700, of hind leg 880//. Antennal joints (counting 

 the so-called 7th joint as 6b) measuring : (1) 70, (2) 60, (3) 270, (4) 190, 

 (5) 184, (6a) 100, (6b) 270. 



Apterous 2 • Clear apple-green (turns yellow in balsam), head and 

 thorax lighter ; eyes black ; legs, antennae and honey-tubes yeilowish- 

 green like head ; fifth and sixth joints of antennae and tip of honey-tubes 

 dusky ; rostrum extending to middle coxae ; lateral tubercles at sides of 

 prothorax (also in winged form), in region of hind legs, and posterior to 

 nectaries, six (three pairs) pointed tubercles in all ; cauda elongate, with 

 rounded, sparsely hairy tip ; legs long, hind tibiae bristly. No capitate 

 hairs. Very young specimens have red eyes. 



Body (adult) about 2430 /x long, antennae about 1000; honey-tubes 

 380 long, 50 broad, the tips level with basal part of cauda; tibia of 

 anterior leg 700, of hind leg 940. Antennal joints: (1) 70, (2) 60, (3) 

 25°. (4) i9°> (5) lS 4, (6a) 100, (6b) 230. 



Hab. — On wild gooseberry ( Ribes, probably R. leptantJium) in an 

 arroyo about five miles S.-W. of Las Vegas, New Mexico. Abundant at 

 ends of twigs, June 2, 1901 ; not curling leaves. Attended by Lasius. 

 Noticeable for the short antenme, three pairs of lateral tubercles, and 

 lack of capitate hairs. It is similar in many respects to M. ribis and its 

 allies, but evidently distinct. From M. ribis proper it differs by the 

 green apterous 2. without capitate hairs and without a dorsal quadrate 

 mark; from M. ribis trifasciata by similar characters, though the colora- 

 tion of the winged forms is more similar ; from M. ribis Bucktonii by the 



