2o6 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



The maxillge consist of a single short, tapering, blade-like, 

 thin but well chitinized maxillar lobe, and a long, slender, 

 five-segmented palpus. Lobe and palpus arise from a basal 

 sclerite, which shows no differentiation into cardo and 

 stipes, and may be taken to represent these two sclerites 

 completely fused. 



The labium consists of a strong, elongate, basal sclerite 

 which presents indications of a line of fusion of submentum 

 and mentum, and a pair of free, fleshy, terminal lobes, the 

 paraglossae. These terminal lobes have no pseudo-tracheae. 

 There are no palpi. 



The hypopharynx is as long or slightly longer than the 

 labrum-epipharynx, is narrower, and although thin, well 

 chitinized. It lies along the dorsal surface of the labium, 

 underneath the labrum-epipharynx. 



The mouth-parts, excepting the mandibles, are carried 

 somewhat forward by the extension of their bases or of the 

 frontal part of the head-capsule. The various parts of the 

 mouth dissect apart readily. 



In Blepharocera capitata Loew a similar condition of the 

 mouth-parts exists, as may be seen from the following 

 account taken from Entomological News (Kellogg, 1900) : 



" The females of Blepharocera, like the females of 

 Simulmm, Cerato^ogon, Dixa, Culex, and some other 

 Nematocera, are blood-sucking, and while the mouth-parts 

 of these forms are not strictly biting, the mandibles are 

 present, as cutting or sawing or piercing organs. The 

 males of these forms are nectar-feeding, and have lost the 

 mandibles. In the mouth-parts of the female Blepharocera 

 all of the parts of the typical biting mouth are present, the 

 mandibles, maxillae and labium. The mandibles are long 

 and serrate on their inner edges, so as to be effective 

 lacerating instruments. The maxillae are elongate and 

 blade-like and have four-segmented palpi. The labium is, 

 though somewhat elongated, truly tip-like, and has its 

 terminal lobes not coalesced and without pseudo-tracheae. 

 The hypopharynx is not short and tongue-like, as in the 

 orthopterous mouth, but is long and slender and stylet-like. 



