41.8 NEW YORK STATE MUSEUM 



base is a branched hair. Tlje mandibles forming the sides of the 

 mouth opening; each jiossess 'two stout, elongate, and four or 

 five shorter black teeth at the apex, a little below which is a 

 ridge with a serrated edge (not shown by Nuttall). Overhang- 

 ing the teeth are three scythe-shaped rays, and between their 

 bases and the base of the teeth are a number of brown hairs and 

 one or more curved spines with a serrated inner edge. Project- 

 ing inward from about the middle of the mandible is a fan of 

 hairs, and usually also several branched hairs are to be found 

 on the outer margin. 



The iDaxilhie (first pair) each consist of a quadrangular piece 

 v:lth curved hairs on the cephalic, and straight ones on the inner 

 margin. On the inner cephalic angle are several stout setae; the 

 palpus is a conical process covered with short hairs, with three 

 elongate s])ines at the tip connected by a web, and several 

 shorter bristles. Laterally, near the tip, is a hair having four 

 branches, each branch with several twigs. The maxillae 

 together with the labium (underlip of Meinert) form the floor 

 of the mouth cavity. The labium is a chitinized piece with seven 

 to nine teeth on the cephalic margin, forming a continuation of 

 tlie ventral wall of the head, to which it is articulated [pl.42, 

 fig.:)]. A small toothed piece, in outline resembling the labium 

 but with fewer teeth, lying just inside of the latter, is what I 

 lake to be the hypopharynx (not shown in figure). Meinert in 

 bis work on Myggelarver [pl.41, fig.24], shows both of these, the 

 one slightly dis]>laced in dissection. The thorax is rounded, its 

 segments obliterated. Twelve long feathered hairs stand on 

 the dorsal surface besides some smaller ones and several sim- 

 ple hairs [pi. 41*, fiu.-]. The nine segmented abdomen is provided 

 with a number of feathered hairs besides many bristles. The 

 first two s(^gments each have two long feathered hairs on each 

 side, the third has one (in all specimens examined); the fourth and 

 fifth on each'side, each with three or four simple hairs united at 

 the base, the sixth, seventh and eighth, with but one or two, be- 

 sides these there are two or three short feathered hairs, and sev- 

 eral short, simple ones on each side of each segment. The only 

 difference which T have observed in the hairy armature of the ab- 

 domen of this species and m a c u 1 i p e n n i s [figured by Nuttall, 

 Journal of Hi/gicnc, v.l, pl.2, fig.4] is the presence of one or two 

 more of the long, simple hairs on the sides of segments 4 

 and 5. The "palmate hairs" on the sides of 3 to 7 mentioned 

 by Nuttall are also present in this species [pl.42, fig.4fl]. On 

 the posterior half of the dorsal surface of the eighth segment 

 is the complex respiratory a])i)aratus which surrounds the two 

 ■stigmata [pl.42, fig.!]. In front of the two stigmata is a brown, 



