. Smithsonian miscellaneous collections. he neck (B, Cvx) by its upper front of the head (A) has the same structure as in the frons (Fr) consists of a median bar expanded above theantennae, and forked below into a pair of arms extending laterally tothe lower ends of the eyes. The large clypeus (Clp) is separatedfrom the frontal arms by an epistomal groove containing laterally NO. BITING AND SUCKING INSECTS—SNODGRASS 51 the anterior tentorial pits (at). The back of the head (C), unlike thatof the mosquito, is mostly nonsclerotized, there being an extensivemembranous area f
. Smithsonian miscellaneous collections. he neck (B, Cvx) by its upper front of the head (A) has the same structure as in the frons (Fr) consists of a median bar expanded above theantennae, and forked below into a pair of arms extending laterally tothe lower ends of the eyes. The large clypeus (Clp) is separatedfrom the frontal arms by an epistomal groove containing laterally NO. BITING AND SUCKING INSECTS—SNODGRASS 51 the anterior tentorial pits (at). The back of the head (C), unlike thatof the mosquito, is mostly nonsclerotized, there being an extensivemembranous area from the neck foramen to the base of the feeding apparatus of Flebotomus argentipes Ann. and been well described and illustrated by Christophers, Shortt, andBarraud (1926), and that of F. papatasii (Scopoli) by Adler andTheodor (1926). The species here figured, F. verrucarum Towns,of South America, does not differ essentially from the others. Theproboscis is relatively short as compared with that of the mosquito,. Fig. 20.—A sand fly, Flebotomus verrucarum Towns., female. Order Diptera,family Psychodidae. A very hairy fly, but hairs removed to show structure.(Length of body 2 mm.) but it is thick and strong (fig. 21 A, B, C) ; the long maxillary palpiare doubled up at its sides. The broad labrum (A, Lm) tapers toa spiny point (F) ; the mandibles (present only in the female) arebladelike (D), finely toothed near the ends (H), and each is providedwith an abductor and an adductor muscle (D, 27, 28) inserted onopposite sides of an articular point (a) ; the broad hypopharynx istraversed to its tip by the salivary canal (G). The maxillae differfrom those of the mosquito in that they are suspended by a pair ofslender rods lying in the membranous posterior wall of the head(C, St) and attached to the cranial margins below the neck rods clearly represent the stipes, or stipes and cardo, of ageneralized maxilla. The maxillary blade, or galea (E, Ga)
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