Vol. X] ALEXANDER— UNDESCRIBED TIPULIDJE 39 



unique species, pilosclla (Osten Sacken). No other species had 

 been definitely referred to this group until the description of 

 Ulomorpha sicrricola Alexander (1918). It is therefore of 

 very great interest to record three additional species of this 

 curious genus from the mountains of California. The rela- 

 tionships of this genus with EulimnophUa Alexander, indicated 

 by Osten Sacken in the generic characterization, have been 

 amply and strikingly shown by the discovery of the immature 

 stages of Ulomorpha pilosclla and several species of Eulimno- 

 phUa (tennipes, recondita, quadrata). 



All three of the new species show marked peculiarities of 

 structure or color. U. qiiinqiic-cellula is the only species with 

 cell Ml present, i. e., with five posterior cells: U. nigronitida is 

 notable by its intense shiny black coloration ; U. vandiizcei has 

 the macrotrichise of the wing-membrane almost confined to the 

 areas beyond the base of the sector and thus approaches, in this 

 respect alone, the genus Adclphomyia Bergroth. 



A Key to the Species of the Genus Ulomorpha Osten 



Sacken 



1. Cell il/i present (California). U. qiiinqiie-cellula, new species 

 Cell Mt lacking. 2 



2. General coloration of the body deep shin^fablack throughout (Cali- 



fornia). U. nigronitida, new species 



General coloration of the body shiny reddish yellow. 3 



3. Macrotrichias of the wing-disk practically confined to the cells be- 



yond the level of the origin of the sector; cells R and 2nd A with 

 few or no macrotrichige (California). U. vanduzeci, new species 



Macrotrichise of the wing-disk more extensive, extending almost to 

 the base of the wing in cells R and 2nd A. 4 



4. Size large (wing of the $ about 9 mm.) ; stigma pale brown but 



distinct; Sc shorter, ending about opposite four-fifths the length 

 of Rs; veins R2 and R^ gradually divergent, cell R2 being con- 

 spicuously widened at the wing-margin ; cell 1st hh broad at the 

 base, the basal deflection of A/1+2 being about equal to r-m. 



(Washington). U. sicrricola Alexander (1) 



Size smaller (wing of the $ about 7.5 mm.); stigma indistinct; 

 Sc longer, ending just before the fork of Rs; veins R2 and Rs 

 almost parallel, slightly diverging near their ends, cell R2 not 

 being conspicuously widened at the wing-margin ; cell 1st Ah 

 narrowed at the base, the basal deflection of M1+2 being much 

 shorter than r-ni (Northeastern North America). 



U. pilosclla (Osten Sacken) (2) 



(1) Ulomorpha sierricola Alexander, Can. Ent., vol. 50, pp. 163, 164; 1918. 



(2) Limnophila pilosella Osten Sacken, Proc. Acad. Nat. Sci. Philadelphia, 1859, p. 

 241; 1859. 



