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MALLOPHAGA 19'1
4. Head evenly expanded behind, broadly triangular and strongly enlarged
above the eyes (infesting poultry and other birds) MENOPONID..E p. 198
Head not evenly expanded and broadly triangular, not enlarged above
the eyes 5
onlerior
: hypophoryngeal
plate
i .. _ lsi maxilla
! ···· .. ·lateral piece
.. . .. f._-c:esophagel
sclarila
FIG. 71. Drawings of important anatomical parts of various biting bird lice. A, head of
the guineapig louse, Gliricola porcelli (Linn.); B, portion of the mouth parts and C. antenna
of Allcistrona porcellira Westwood (after Cummings. 1913}; D. mouth parts and E. antenna
of Menopon stramineum Nitzsch; G. hypopharyngeal plates of Ancistrona vagelli (Fab.)
(after Snodgrass, 1899).
5. Sides of head with strong swelling in front of the eyes; spiracles on abdominal
segments III to VIII, inclusive (infesting birds)
LJEMOBOTBlUIDlE p. 199
Sides of head straight or concave; spiracles on abdominal segments II
to VII, inclusive (infesting birds) • lUCINID)E p. 199
Family GYROPIDlE Kellogg 1908 (Gy-rop'i-dre, from the Greek 'YOpos, a
ring, circle, + '!rovs, foot; from the hair.clasping feet). Biting Guinea
Pig Lice.
A small family of Central and South American species infesting rodents.
Two species, the guinea pig louse, Gliricola porcelli (Linn.) (Gyropus gracilis
Nitzsch), and the oval guinea pig louse, Gyropus ovalis Nitzsch. infest guinea