286 U.S. NATIONAL MUSEUM BULLETIN 277 



Paratypes: 7cf c^, 5 9 9 , Mossel Bay, s. Cape Prov., [Republic of] 

 South Africa, October, December 1938 (R. E. Turner) ; 1 9 , Worcester, 

 s.w. Cape Prov., [Republic of] South Africa, December 1933 (R. E. 

 Turner) all (BMNH). 



Genus Heteromphrale Krober 



Hetero7nphrale Krober, 1937, p. 221. 



Type-species Pseudatrichia chilensis Krober (original designation). 

 The genus Heteromphrale is closely related to the preceding genus and 

 Brevitrichia but may be distinguished from Brevitrichia by the elongate 

 female eighth sternum and from Propebrevitrichia by the basal forking 

 of vein R4. The male genitalia is more robust than in the other two 

 genera. This genus is Neotropical in distribution. 



191. Heteromphrale cyanops (Edwards), new combination 



Figure 185 



Pseudomphrale cyanops Edwards, 1932, p. 259. 



This species is distinguished by the wing venation which is similar 

 to Brevitrichia and by the much heavier ninth tergum, short peni and 

 aedeagal parameres, and larger heavier internal structures associated 

 with the aedeagal syringe; see figure for details. 



Length: Male body 2.5 mm., wing 2 mm. 



Type-locality: Montevideo, Uruguay; 21 January 1927 (F. and 

 M. Edwards). 



Type: (BMNH). 



192. Heteromphrale chilensis (Krober) 



Figure 186 



Pseudatrichia chilensis Krober, 1928b, p. 31. 

 Heteromphrale chilensis (Krober), Krober, 1937, p. 221. 



This species is recognized on the basis of the wing venation which 

 is similar to that of Brevitrichia and on the basis of the spines on the 

 ninth tergum. The long eighth sternum separates it from species of 

 Brevitrichia; see figure for details. 



Length: Female body 5 mm., wing 2.6 mm. 



Type-locality: Concepci6n, Chile (P. Herbst). 



Type: (ZMH). 



Genus Prepseudatrichia, new genus 



Type-species Prepseudatrichia mateui, new species. The genus 

 Prepseudatrichia is most interesting in that the head and thorax 

 are distinctly Pseudatrichia-like, while the wings are typical of 

 Scenopinus. Both the male and female genitalia are distinctive. 



