18 APHIDS OF THE ROCKY MOUNTAIN REGION 
Genus Schizolachnus Mordvilko 
Mordvilko, 1908:375; Baker 1920a:16. ; ! 
Characters. Antenna six-segmented. Rostrum with terminal segments 
short, tip obtuse. Ocular tubercle inconspicuous. Fore wing with media only 
once-branched or simple. Living on needles of Coniferae. Only one species 
known in region. 
Genotype (fixed by Mordvilko, 1908), Aphis tomentosa De Geer (Syn. of Aphis 
pineti Fabricius). 
Key to Species of Schizolachnus 
1. Hind tibia slender (.065 in diameter); hind tarsal II .30-.37 (p. 18).................- pini-radiatae 
Hind tibia heavy (.09 in diameter) ; hind tarsal II .25-.28 (p. 18) -............---.2200cceeeeeeeeeeo>- pineti 
[Genotype Schizolachnus pineti (Fabricius) ] 
ed wuyply 
IV, 
fel Ad Wi rh, 
CIR aS 
Alfate AL MLA ge LA fh 
RE oR 
Fig. 12. Schizolachnus pineti 
Aphis tomentosa pini de Geer, 1773:39; Del Guercio, 1909a:283. 
Aphis pineti Fabricius, 1781: 389 and 1794:219. 
Lachnus tomentosus de Geer, Cholodkovsky, 1898:635 and 643; van der Goot, 1915:409. 
Schizolachnus tomentosus, Theobald, 1929:161. 
Schizolachnus pineti, Hottes, 1930b:187 (nomenclature). 
Apterous Summer Vivipara. Body brown to dusky green; covered with woolly secre- 
tion also caught on legs; legs brownish; antenna distal to middle of V, rostrum, coxae, tips 
of tibiae, tarsi, cauda, anal plate and ventral area on abdominal VIII blackish; antenna pale 
to middle of V. Body length 2.2-2.7; across eyes .50; hind tibia 1.2-1.3; antenna .95-1. 
Rostrum attaining 3d coxa. Cornicle somewhat mammiform with shallow base which bears 
a few hairs. Cauda semilunar. Hairs numerous; on body and vertex .12 long. Appendages 
stout; antennal III .06 in diameter; hind tibia .09 at middle, thicker in proximal half; hind 
tarsal II .04 in diameter. 
Alate Vivipara. Head and thorax black; abdomen brown to dark brown or dusky dark 
green; covered with woolly secretion. Dark markings same as in apterous vivipara. Body 
length 2.8; hind tibia 1.2-1.4; antenna about 1; secondary sensoria weak, irregular and small. 
Other characters as in apterous vivipara. Fore wing with media once-branched and faint. 
Male. Alate. Color as in alate vivipara. Body length about 1.50; antenna 1.30, III .45, 
IV .28, V .27, VI .12+.03; sensorsia 20 or more on III, 8 on IV and 7 on V; hind tibia .70; 
hind tarsal II .22. Otherwise as in alate vivipara. 
Habitat. On Pinus sylvestris, P. mughus and P. pinaster, on needles. (Not 
taken in region.) 
Data for above description and figures obtained by study of specimens 
determined by Cholodkovsky, van der Goot and Hille Ris Lambers and from 
descriptions cited above. Color description from Cholodkovsky (op. cit.) and 
van der Goot (op. cit.). 
Schizolachnus pini-radiatae (Davidson) 
The Woolly Pine Needle Aphid 
Lachnus pini-radiatae Davidson, 1909:299. 
Lachnus tomentosus De Geer, (misidentification), Gillette 1917a:140. 
Schizolachnus pini-radiatae, Gillette and Palmer, 1931:842. 
Fundatrix. Newly Hatched. Dark olive-green with pale yellow appendages. A few 
hours later body is covered with a slight grayish bloom and appendages are darker and corn- 
icle is surrounded by a dusky spot. Body length 1. Adu/t. Same as summer aptera. 
