OF WASHINGTON. 



39 



shorter than these, while the sixth spine is small and very short. 

 Inserted ventrally, just behind the antennae, is a pair of pendant append- 

 ages about equal in length to the antennal segment. Each of these 

 appendages consists of five long filaments united at the base. About 

 midway between these and the maxillae are delicate pendant organs 

 termed " leaflike appendages" by Dr. E. P. Felt (N. Y. State Mus., 

 Bui. 79). In the present species these leaflike appendages are ex- 

 tremely long and slender and their length is about two thirds that of the 

 antennal segment. Beyond the base these appendages expand into a 

 small lamellate portion which remains quite small and again tapers 

 into the very long and slender point. The anterior margin of the 

 appendage gives rise to a series of long rays and on the posterior 

 margin the basal fourth is unarmed while beyond are a succession of 

 these slender spines. The maxillae are long, stout and prominent, 

 projecting downward just in front of the mandibles. Outwardly, near 

 the front margin at about the middle, there is a slender spine. Near 

 the apex of the maxillae there is a group of coarse setae. The mandi- 

 bles are large, stout and prominent, concave on the inner side and 

 with six long, stout, curved teeth on the apical margin; on the outer 

 surface there is a coarse spine inserted above the teeth. At the base, 

 on the inner surface, is inserted a dense tuft of long hairs. The labial 

 palpi are represented by tubercles bearing a stout, long spine. 



FIG. 7. Sayomyia punctipennis : Terminal segment of larva. 



The thorax is elongate, hexagonal; the three segments fused. The 

 air-vesicles, at its posterior third, are short and rounded, obtusely 

 pointed in front. First abdominal segment shorter than the succeeding 

 ones. Air-vesicles of the seventh abdominal segment small, rounded. 

 Thorax and abdomen with several series of delicate, white, sensory 



