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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 39 



where they lie below the mandibles (fig. 3 C-F, Mx). The principal 

 part of each maxilla is a flat lobe (fig. 6 D, St ) of different shape in 

 different species, bearing brushes of long setae or combs of shorter 

 ones. Laterad of this lobe is a second cylindrical or fusiform lobe 

 regarded as the palpus {Pip) varying in size relative to that of the 

 mesal lobe. At the base of the palpus is usually a small sclerite (x) 

 in the articular membrane. 



Fig. 6. — Larval maxillae, right, ventral. 



A, Tipida abdominalis. B, Culex vorax. C, Culex sp. D, Aedes aegypti. 

 E, Anopheles qnadrimacidatus. F, Toxorhynchites rutilus. 

 Pip, palpus ; St, stipes ; x, sclerite at base of palpus. 



In other nematocerous larvae, as in Tipula (fig. 6 A), the maxillary 

 palpus (Pip) is a small lateral appendage of the main maxillary lobe, 

 as it is also in the culicid Culex vorax (B). In most mosquito larvae, 

 however, the palpus appears to have somehow become separated from 

 the rest of the maxilla (C-F). The main maxillary lobe in some 

 nematocerous larvae, as shown by Anthon (1943a), may bear on its 

 distal margin mesad of the palpus two variously developed out- 

 growths, which are identified as the galea and lacinia. The main 

 maxillarly lobe, therefore, appears to be the stipes (St) . The nature 

 of the small sclerite (x) at the base of the palpus is uncertain. Cook 



