226 Maine; agricuIvTurai, e;xperime;nt station. 1909 



One specimen from Professor Aldrich. Friday Harbor, Wash. 

 This species differs in several important structural characters 

 from the following, though for the present they will be left in 

 the same genus. 



2. Palceoplatytira johnsoni n. sp. 

 Male. Length 5 mm. Head subshining black; ocelli in a 

 transverse line set low on the front, the median one smaller 

 than the laterals. Face fuscous, oval margin produced and 

 covered with erect black setae; labellse and palpi yellow, both 

 of medium size, the latter with 4 joints of which the first and 

 second are subequal, the third about thrice, the fourth 4 times 

 as long as the first, all with a few black setse, those of the fourth 

 small and inconspicuous; the scape yellow, the basal joints of 

 the flagellum yellowish, the remaining joints fuscous; first 

 flagellar joint about twice as long as wide, the other joints but 

 little longer than their width ; whole antenna if bent back would 

 scarcely reach the metanotum. Mesonotum shining yellow with 

 3 brown stripes, the middle one widest, setse black, sparse, not 

 arranged in longitudinal rows ; scutuUum yellow, without promi- 

 nent setse; metanotum and pleura except at base of the wing, 

 brown. Abdomen brown, the apical margin of the segments, 

 except of the first, yellow ; set^ black. Posterior end and 

 hypopygium crushed in the single specimen, hence cannot be 

 described. Coxse and legs yellow, tarsi more dusky, fore meta- 

 tarsus slightly longer than its tibia, setae of middle and hind 

 tibiae small and inconspicuous, shorter than the diameter of 

 the tibia; one spur on fore tibia, 2 subequal ones on each of 

 middle and hind tibiae; empodium consists of a few short setse, 

 the claws each with 2 short, stout, straight teeth proximad of 

 the middle. Wings (fig. 78) grayish hyaline with markings 

 as follows : an oval brown spot covering the R — M crossvein 

 and extending distad to beyond the fork of the media with a 

 tiny hyaline spot in it just distad of the crossvein; a small brown 

 spot at costal margin and filling the space between R2+3 and 

 apex of Ri; an elongate spot covering the apical end of Cu= and 

 faintly merging into the posterior end of the subapical brown 

 band which arises on the costa between the extremities of the 

 branches of the radial sector and extends posteriorly more 



