408 XEW YOUK STATE MUSEUM 



base is a brancjiod liair. The mandibles formiii": the sides of the 

 mouth opeuin};: eacli ])Ossess 'two stout, elongate, and four or 

 live shorter blaclv tectli at the ajM-x, a little below which is a 

 ridge with a serrated edge mot shown by Nuttalll. Overhang- 

 ing the teeth are three scvthe-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 fi-oiu about the middle of tlie mandible is a fan of 

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

 on the outer margin. 



The maxillae (first i)air) each consist of a quadrangular ])iece 

 with curved hairs on the cephalic, and straight ones on the inner 

 margin. On the innrr cephalic angle are several stout s<'tae; the 

 l»alpus is a conical process covered with shoit hairs, witli three 

 I'longate spines at the ti]i connected by a web. and several 

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

 branches, each branch with several twigs. The tnaxillae 

 together with the liibium (underli]) of Meinert) form the floor 

 of the mouth cavity. The labium is a chitinized ]>iece with seven 

 to nine teeth on the cejdialic margin, foi-ming a conlinuatiou of 

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

 fig.^i]. A small toothed pie<'e, in outline resembling the labium 

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

 take to be the hy]>o])harynx mot shown in figure). Meinert in 

 his work on Myggelai-ver [})1.41, fig.l24]. shows both of these, the 

 one slightly disjjlaced in diss<Mtion. The thorax is round«Hl. its 

 segments obliterated. Twelve long feathered hairs stand on 

 the dorsal surface besides some smaUer ones and several sim- 

 ])le hairs [}il.4L'. tig.L']. The nine segmented abdomen is ])rovided 

 with a nuuiber of featlu'red hairs Ix'sides many bristles. The 

 first two se;imients (>ach have two long feathered hairt* on each 

 side,the third has oneiin all siK'cimens examined);th<' fourth and 

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

 the base, the t^ixth, seventh and eighth, with but one or two, be- 

 sides these there are two or three short feathei'ed hairs, and sev- 

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

 ditfi rence wliich I have observed in the hairy armature of the ab- 

 domen of this species and m a c u 1 i j) e n n i s [figured by Nnttall, 

 Jouniol of Hiff/icu<\ v.l, pi. 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 '- palm.nte hairs " on the sides of '^ to 7 mentioned 

 by Nuttall are also ])resent in this species [pi. 42, fig.4fl]. On 

 the ])osterior half of the dorsal surface of the eighth segment 

 is the complex res])iratory aj^jiarattis which surrounds the two 

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



