248 ENTOMOLOGICAL NEWS. [Oct., '03 



The accompanying portrait is very characteristic, and seems 

 to the writer to express the character of his subject better than 

 a lengthy description. One can read in it the energetic, earnest 

 character of Dr. Hough ; and there is a suggestion also of warmth 

 and geniality ; but there is not any indication of lack of interest 

 in the great paftorama of modern life. It is impossible to think 

 that Dr. Hough will not occasionally find time to read the en- 

 tomological journals ; and it is dollars to doughnuts that he 

 will tell the younger fellows in a few years, as Dr. Williston 

 recently said of himself, ' * The happiest days of my life were 

 ■when I was working on the Diptera." 



A New Aphid on Thistle. 



By T. D. a. Cockerell. 



Aphis ochrocentri n. sp. 



Apterous 9. — About 3 mm. long, stout, pyriform ; head, thorax and 

 most of under parts pale pink ; abdomen brownish plumbeous, delicately 

 pruinose, more or less shining on disc ; two segments anterior to cauda 

 pale green ; cauda short and slender, black or nearly so ; femora with 

 basal half yellowish-white, apical half black ; tibiae and tarsi, antennae 

 and (slender) nectaries black : antennae, folded backward, falling short 

 of bases of nectaries by a distance equal to about half length of necta- 

 ries (in younger forms they extend a little beyond bases of nectaries) ; 

 nectaries over twice length of cauda ; cauda about as long as hind tarsi ; 

 beak extending considerably beyond hind coxae. Larva pink. 



Winged 9- — 2! mm. long. Similar but darker; bases of wings deli- 

 cate pale green. In the following description the measurements are all 

 in micromillimeters. Antennal joints : (i) 100, (<2) 90, (3) 600, (4) 380, 

 (5) 360, (6) 150, (6a.) 660 ; third joint with extremely prominent sensoria, 

 over 25 above and below ; fourth with about six sensoria, on under side. 

 Beak very long, reaching abdomen ; length about 1400, its terminal joint 

 350 ; cauda about 200, slender ; nectaries rugose-tessellate, 500 long, 60 

 in diameter, not at all swollen in middle ; hind tarsi (with claw) about 

 230. Antennae not as long as body. 



Hab. — Pecos, New Mexico (alt. prox. 6700 ft.), July 13, 

 1903, abundant on Cardiius ochrocentrus (Gray). Allied to A. 

 cardui, but quite distinct. 



On Aug. 9, I took Macrosiphum erigeronensis {Siphonophora 

 erigeronensis Thos., 1878) on Erigeron subtrmervis at Pecos, 

 N. M. The species is new to New Mexico. 



