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Psyche 
[Vol. 89 
Myopsocus unduo sus (Hagen) 
Psocus unduosus Hagen 1859:201. 
Myopsocus unduosus (Hagen) Hagen 1866:210. 
Type material and its examination. — Types consist of two males, 
originally pointed, in the Museum of Comparative Zoology, Cam- 
bridge, Massachusetts. Each bears a type label with MCZ number 
10118 and the label “Ceylon, coll. Nietner.” I first examined these 
types in January 1970, ascertained that both are males of the same 
species, and selected one as lectotype. I then soaked the lectotype off 
the point, placed it in 80% ethanol, mounted the right wings on a 
slide in euparal, and cleared and figured the external genitalia. Early 
in 1982, I borrowed the wing slide and made figures from it. 
Measurements (mm). — Forewing length = 3.94; hindwing length = 
3.22; posterior tibial length = 1.72; least distance between com- 
pound eyes = 0.27; transverse diameter of compound eye = 0.42. 
Color characters. — Forewing (Fig. 1) with fairly distinct, mottled 
crossband in basal half of wing; a distinct stigmasaum darkly 
marked in middle; entire margin and most of veins with alternating 
dark and light marking. Hindwing (Fig. 2) unmarked except for 
brown clouding at base and along anterior margin and alternating 
dark and light marking along margin from distal end of Rj to distal 
end of R 4+5 . All femora dark brown with a narrow yellowish-white 
preapical ring. 
Structural characters. — Forewing (Fig. 1) with relatively long 
Rs-M fusion, short M-Cuj fusion. Hindwing with Rs-M fusion 
slightly longer than segment of Rs before it. Hypandrium (Fig. 3) 
elongate, tapering distally, with slightly bulging, shagreened area on 
each side at about distal two-thirds of length; distal end on each side 
with field of heavy setae, each seta tapering toward end and base. 
Phallosome (Fig. 4) elongate, slender; median style separate from 
lateral arms at about two-thirds distance from base to tips of arms 
and extending beyond tips of arms. Epiproct (Fig. 5) semicircular 
except truncated distally, the distal end beset with minute tubercles. 
Paraproct (Fig. 6) bearing bluntly rounded distal process; sense 
cushion with 28 trichobothria, all with basal florets. 
Diagnostic Features and Synonymy of Myopsocus Hagen 
Various authors have noted the constancy within and among spe- 
cies of the two character states Rs and M joined by a crossvein 
