62 C. H. TYLER TOWN8END. 



fifth abdominal segments ; tlie females liave it prononnced on these 

 segments, and also on third segment in two specimens. In all other 

 respects these specimens agree closely with Williston's description. 



22. Coiiops xantlioparoHS Will. 



Riley County, Kansas (F. Marlatt), August and September ; two 

 males. Length 10-11 mm. Agrees well with Williston's description ; 

 costal cells dilute yellowish. The subhyaline in discal cell appears 

 rather to form, with that of first basal, a single rather clear stripe. 



23. Physo cephala aftinis Will. 



Constantine, Mich., September 6 ; one female. Length nearly 13 

 mm. Vertex pale reddish. The median )^-shaped line of front more 

 blackish ; facial grooves smoky brownish in middle of each ; humeral 

 pollinose spots golden-yellow ; coxse silvery. First posterior cell with 

 a rather small median hyaline spot on inner edge ; four costal cells 

 yellowish hyaline. 



There is but little difference between this species and emtanoptera 

 besides the hyaline outer portion of discal cell and the hardly less 

 hyaline outer portion of submarginal. 



24. Physo cepliala castaiioptera Lw., Neue Reitrilge, i, .33. 

 Constantine, Mich., August 31 ; one male. This is a valid species, 



distinct from sagittaria Say. It will be distinguished from the latter 

 by the vellowish vertical callosity ; the red lateral and hind margins 

 of thoracic dorsum ; the red pleurse, scutellum, prescutellar marking, 

 and upper border of metanotum ; and by the costal cells being dis- 

 tinctly clear or slightly yellowish. The red prescutellar marking is 

 a parallelogram joining the red border of the thorax. Coxae brown, 

 silvery pollinose outwardly; legs red, tarsi brownish on terminal 

 joints, basal half of tibiae more yellowish. Second abdominal seg- 

 ment red, except a blackish patch on disc ; first segment reddish, 

 brownish on disc ; third segment red anteriorly. Metanotum black, 

 except the red upper border. 



Las Cruces, N. Mex., June 4 and 26 ; one male and one female. 

 These differ from the Michigan specimen in having abdominal seg- 

 ments 4-6 more golden pollinose, and the vertical callosity is slightly 

 tinged with reddish. 



25. Pliyso cepliala oclireieeps Bi.tj-: Will., Biol. C.-Am., nii>t. iii, 83-4. 

 Las Cruces, N. Mex., June 28 ; one female. Differs from Willis- 

 ton's description of P. te.mna as follows : Length lO.") nun. ; third 



