200 Annals Entomological Society of America ' [Vol. II, 



Measurements (from specimens mounted in balsam) : — Length of 

 body, 0.90—1.47, avg., 1.16 mm.; width. 0.40—0.60, avg., 0.50 mm.; 

 length of wing, 1.78 — 2.14, avg., 1.98 mm.; width, 0.69 — 0.83, avg., 

 0.76 mm.; avg. expanse. 4.67 mm.; antenna. I, 0.09; 11, 0.05; III, 

 0.325— .043. avg., 0.375; IV. 0.21—0.28. avg., 0.245; V, 0.21—0.26, 

 avg., 0.24: VI. base, 0.09—0.11. avg.. 0.10; VI, filament, 0.505—0.57, 

 avg., 0.54; average total, 1.64 mm.; cornicles, avg.. 0.25 mm.; style, 

 avg., 0.12 mm. ; hind tarsus. 0.065 mm. 



Described from 14 specimens. 



Wingless viviparous female: — Body black with whitish dots scat- 

 tered over the surface. Eyes black. Antennae pale excepting the 

 last segment and distal ends of the others; 2 or 3 circular sensoria in a 

 row on basal half of III; segments about in same proportion as in 

 winged (PI. XXVI 1, Fig. 15). Legs whitish excepting tarsi, which are 

 fuscous. Cornicles and style as in winged forms. 



Measurements (from specimens in balsam) : Length of body, 

 1.23 — 1.42, avg., 1.32 mm.; width, 0.65 — 0.78, avg., 0.73 mm.; 

 antenna, I, O.IO; 11, 0.05; III, 0.36—0.42, avg., 0.38; IV, 0.23—0.26, 

 avg., 0.24; V, 0.23—0.275, avg., 0.255; VI, base, 0.105: VI. filament, 

 0.51 — 0.56, avg., 0.53; average total, 1.66 mm.; cornicles, 0.27 mm.; 

 style, 0.135 mm.; hind tarsus. 0.08 mm. 



Described from 4 specimens. 



Two type slides, one deposited in the Illinois State Laboratory 

 of Natural History as Accessions No. 42533, and the other in the 

 writer's collection. One cotype slide in U . S. National Museum 

 as No. 12629. 



EXPLANATION OF PLATE XXVIL 



Phyntatosiphnm- monelli n. g. et n. .sp., figs. 1-S: Fig. 1, fore wing; Fig. 2, 

 fore femur, a, V)a.sal end; Fig. o. hetid ; Fig. 4. antenna; Fig. 5, hind wing; Fig. (i, 

 dorsal abdominal tubercle; Fig. 7, cornicle; Fig. 8, style of winged viviparous 

 female. 



Idioptcrus nephrelcpidis n. g. el n. sp., figs. 9-15; F"ig. 9, head; Fig. 10, 

 fore wing; Fig. 11, antenna; Fig. V.l. hind wing; Fig. 13, cornicle; Fig. 14, style 

 of winged viviparous female; Fig. 1."), antenna of wingless viviparous female. 



