20 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



Described from tliree males (including type) and one female (allo- 

 type) collected on July 13-18, 1923, by D. C. Graham, west of Chetu 

 Pass, near Tatsienlu, Szechuen Province, China; altitude over 

 13,000 feet. 



Type.— Male, Cat. No. 28S98, U.S.N.M. 



MICROSILLUS, new genus 



Type of genus. — HougJiia haccharis Reinbard.^ 



The genus is related to Siphosturmia Townsend, from which it 

 differs in having the first vein setulose near the base, the second 

 antennal joint much shorter than the third, and the vibrissae consid- 

 erably nearer the lower margin of the head. It differs from Houghia, 

 to which it would run in Coquillett's and Adams's keys, in having the 

 face flat and somewhat projecting below, while in Houghia setipennis 

 it is very deeply excavated and strongly receding; also the proboscis 

 in HougJiia is very short. The female shows the same conical, pointed^ 

 red fourth abdominal segment as in Siphosturmia; the other structural 

 characters are also substantially the same, including the form of the 

 proboscis which is slender but not much elongated. 



The palpi are normal; vertical bristles two pairs; ocellars well 

 developed and prochnate; two upper frontals reclinate, stout but 

 not very long; two large proclinate orbitals; four sternopleurals; 

 about three stout bristles on the outer front side of middle tibia. 



The single type specimen, now in the National Museum, was col- 

 lected at College Station, Texas. 



A second species, very closely related to setipennis, is Siphosturmia 

 pollinosa Townsend.^ This also has the first vein setulose near the 

 ])ase, although the fact was not mentioned in the original descrip- 

 tion. It ma^v" even be identical with haccharis, in which case it will 

 take priority, but the single specimen of haccharis seems to differ 

 slightly from the six specimens of pollinosa (four types from Somate,. 

 Peru; two specimens from Piura, Peru) in the National Museum 

 collection in having the pollen a Httle whiter or more silvery and 

 that on the abdominal segments a little more defined at the bases,, 

 so that in haccharis there are very distinct, alternating crossbands of 

 black and white, which to the naked eye are of about equal v/idth. 

 I can see no structural differences, but having only one specimen of 

 haccharis I can not judge of the extent of variation which may 

 occur. I therefore consider the two species distinct for the present, 



SIMOMA, new genus 



Huns to Erynnia in Stein's 1924 Key to the Eiu-opean Genera, but 

 is different in having the antennae inserted below middle of eyes, the 



* Annals Entomological Society of America, vol. 14, 1921, p. 332, with figs. 5 and 6. 

 ' Prac. U. S. iVitianil Mu«um, vol. '13, 1912, p. 321. 



