70 NEW YORK STATE MUSEUM 



into quite a short process, while the inferior appendages are much 

 incurved, also asymmetrical, one of the appendages having a large 

 ante-apical swelling or blunt tooth. In r t h o t r i c h i a 

 angustella McL. the side pieces are apparently on much the 

 same plan, but tlie appendages are strongly divergent. 



8. Orthotrichia brachiata, n. sp. 



Although but one poor specimen existed in the collection, I have 

 no hesitation in referring this to the genus Orthtrichia 

 on its general characters. As a species it is critically near O . 

 angustella and the two are almost certainly representative 

 of each other on the two continents. In . b r a c h i a t a the 

 side pieces appear to be asymmetrical, but the specimen is some- 

 what damaged in this respect. The penis is typical of the genus 

 and is notched at the apex. Alongside of it is a very strong acute 

 sheath and under it a cover with rounded apex. The inferior 

 appendages are very strongly divergent, aristate. Above these 

 (according to what is found in O. angustella) there should 

 be two spiniform processes slightly divergent and terminating in 

 a hair, but in the specimen before me these can not be made out 

 satisfactorily. The margin of the last ventral segment has a 

 small chitinized median plate broader anteriorly and with excised 

 fore and hind margins, the posterior projections each bearing a 

 short bristle. The dorsal plate is as usual unequal on its two 

 sides, but I can see no trace of teeth, although portions of the 

 margin are more or less strongly chitinized. 



It is to be regretted that the material is so unsatisfactory, but 

 the figures should serve for identification. 



OXYBTIITRA 



This genus, conspicuous on account of its narrow wings, has 

 proved one of the most prolific of species in the European fauna. 

 No estimates can be placed on the number of species that may 

 eventually be found in North America ; the possibilities are 

 boundless. 



9. Oxyethira coercens, n. sj). 



Antennfe in tlie rT about 31-jointed. 



The last segment dorsally is semicircularly excised when 

 viewed from above; seen from the side the edges are strongly 



