l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



the body of the maxilla, separated into several sclerites, two distal 

 lobes, the galea (ga) and the lacinia (Ic), and the maxillary palpus 

 (nixp). The body of the maxilla is composed fundamentally of three 

 parts, the cardo, the stipes, and the palpi fer. The cardo (cd) is the 

 basal sclerite, which articulates at its mesal edge with the subgenae. 

 The stipes (st) is secondarily divided into two sclerites, apparently 

 the proximal or mesal one bearing the large lacinia (Ic) and the galea 

 (ga), while the distal or lateral one bears the palpus on its extremity. 

 The lacinia is a large, densely hairy lobe, which is movable on the 

 stipes but is apparently united to a considerable extent to the base of 

 the galea (sg). The galea is covered with hairs similarly to the lacinia, 

 but is placed distad of that organ and curved around the tip of it. 

 The lateral corner of the galea bears a few long setae. The stipes 

 bears the maxillary palpus on its extremity without the differentiation 

 of a definite palpifer, the first segment of the palpus being joined to it 

 by a membrane. The palpus (fig. 2 H) is four-segmented and nearly 

 filiform. The basal segment is very small and is strongly geniculate. 

 This arrangement allows the second segment to extend laterally at 

 right angles to the axis of the maxilla. The second segment is rather 

 swollen and larger than any of the others, and it is somewhat arcuate. 

 The third segment is narrow at the base but expands at the apex to 

 approximately the same size as the second. It extends cephalad from 

 the tip of the second and is also slightly arcuate. The last segment is 

 nearly straight, cylindrical, and both shorter and narrower than the 

 two preceding. It is, however, slightly wider than the third at the 

 base, and is obtusely rounded at the apex. All the segments are very 

 sparsely beset with small setae, and the first three bear longer setae 

 near their apices. The terminal segment also bears at the base of its 

 dorsal surface an area of small close-set setae. The distal end of this 

 segment bears a small area of what appear to be sensory papillae, ex- 

 tremely minute and gathered in a slight emargination in the tip. The 

 distal two-thirds of the segment have a few scattered pores similar to 

 those found on the labial palpi (fig. 2 C, p) but somewhat larger. 

 There are also a few fine canaliculi as described from that organ (can) . 



The labium (fig. 2 A) is composed of three parts, the submentum, 

 mentum, and prementum, the last bearing a pair of segmented palpi 

 and three membranous lobes. The basal piece is the submentum. which 

 attaches the labium to the head. It is separated from the postgenae 

 by the submental sutures and is continuous with the gula between the 

 tentorial pits. 



The submentum is expanded anteriorly to clasp the base of the 

 mentum. The mentum is a transverse sclerite, heavily sclerotized, and 



