SUBFAMILY APHINAE 13 
possibly being the summer form of querci. The characters of these grass species 
seem, however, to be distinct as set forth under the respective species. These 
three forms are accordingly held separate until further investigation proves 
otherwise. 
From A. corni this species is separated by the following characters: Round 
sensoria (not narrow-elongate), smaller number of sensoria (not more than 8) 
on III of alata and shorter antenna (III in aptera “13”, not .32-.35; in alata 
.20-.33, not .46-.50). 
Anoecia setariae Gillette and Palmer 
Fig. 6. Anoecia setariae 
Anoecia setariae Gillette and Palmer, 1924:4 and 1931:834; Mordvilko 1935:296 (erro- 
neously as synonym of A. cornicola Walsh). 
Apterous Summer Vivipara. Pale orange-yellow, tinged with brownish on head; with 
slightly dusky dashes on dorsum of abdominal IV to VII inclusive and lateral areas on all; 
cornicle and appendages pale yellowish, dusky on tips of tibiae and entire tarsi. Body length 
1.9; antenna .60-.65; hind tibia .55-.60; rostrum attaining abdominal I. Hairs on body pointed, 
fine and often bent posteriorly near base. 
Alate Vivipara. Head and thorax black; abdomen pale green with slightly dusky dorsal 
dashes on all segments; cornicle and appendages pale. Body length 1.9; hind tibia .70; an- 
tenna .70. 
Collections. On roots of Setaria sp. and Echinochloa crusgalli. Idaho: 
Rexburg. Colorado: Fort Collins. Apterous viviparae Aug. 12 to Sept. 21; 
alate viviparae July 21 to Sept. 21; rather rare. 
Type. U.S.N.M., No. 41951. 
Chief Distinguishing Characters. Hairs straight (not bent), body pale with 
dark dorsal patch absent on fall migrants, length of III in summer aptera (about 
.24), and length of unguis (third of base of VI). 
Subtribe Eulachnina Baker 
Baker, 1920a:13. 
Characters. Body narrow and elongate, hardly broader than head. Eyes 
prominent, lacking tubercles. Hind tarsal I elongate, dorsal side over half as 
long as ventral side. Cauda rounded; cornicle shallow, not on hairy cone. 
Rostrum obtuse; segment V reduced to mere tip. Stigma elongate; radial sector 
straight, arising at lower distal angle of stigma. Living on needles of Coniferae. 
Key to Genera of Eulachnina 
Peer itennia six-sepmented, bearing hails OF Spities  c-.-..-c.5ccecdecceccececencec-nncesnacecucuoreneeendertervecnsannessnoee 2 
.. Antenna five-segmented bearing minute bristles or naked (p. 13).......--...:..::20------ Essigella 
Zecornicle mere ring. Hind tarsal I with dorsal hairs (p. 16) -..-..-..--.--.-.-.0.tis---0-- Eulachnus 
Cornicle small cone with few or no hairs. Hind tarsal I dorsally without 
REEL CE ASLCE ALT SU ay wel Sy ge eee Me eet hare At Bee ed ee OS eee tetra Schizolachnus 
Genus Essigella Del Guercio 
Del Guercio 1909a:329 and 1909b:74; Baker, 1920a:14. ui 
Characters. Body elongate and narrow, parallel-siced. Head much broader 
than long, eye prominent, ocular tubercle absent. Antenna of five segments 
(III and IV coalesced) bearing only a few minute bristles; unguis bearing pri- 
mary sensorium. Fore wing with media faint, once-branched or simple. 
Rostrum broadly obtuse, segment V reduced to mere tip. Cornicle mere ring, 
