4C8 NEW YORK STATE MUSEUM 



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

 mouth opening-; eacli possess '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 Xuttall). 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 maxillae (first pair) each consist of a quadrangular piece 

 with 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 spines at the tip connected by a web, and several 

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

 bi-anches, 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 

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

 fig.3]. A small toothed piece, in outline resembling the labium 

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

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

 his work on Myggelarver [pi. 41, fig.24], shows both of these, the 

 one slightly displaced 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 [pl.42, fig.2]. The nine seginented abdomen is provided 

 with a number of feathered hairs besides many bristles. The 

 first two segmimts 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 I have observed in the hairy armature of the ab- 

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

 Journal of Hygiene, 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 " palmaite hairs " on the sides of 3 to 7 mentioned 

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

 the posterior half of the dorsal surface of the eighth segment 

 is the complex respiratory apparatus which surrounds the two 

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



