1 88 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Blepharocerid species (the new species described in this 

 paper not included), representing ten genera, known in the 

 world. Of these, five species, representing four genera, are 

 found only in North America, north of Mexico; six species, 

 of four genera, are found only in Europe; three species, of 

 three genera, are South and Central American; and a 

 single species is recorded from Ceylon. But one species 

 extends its range outside of a single continent, although 

 two genera are represented by both European and North 

 American species. A discussion of the relationships of 

 these widely scattered forms is included as part of this paper. 



The immature stages of three of these fifteen known 

 Blepharocerid species have been described, viz. : Liponeura 

 hrevirostris (Europe) by Dewitz (1880) and Wierzeijski 

 (1881), Curi^ara torrenttum (Brazil) by Fritz Miiller (1881), 

 and Blefharocera capitata by Comstock (1895) and the writer 

 (Kellogg, 1900). 



In this present paper the writer presents the descriptions 

 of four new North American species found by him in the 

 mountains of California, and, in addition, an account of 

 the immature stages of each of these new species. The 

 descriptions of the larval stages of at least two more species 

 whose adult stages are not yet known are also presented; 

 and the descriptions of larva and pupa of a species previously 

 known only in the adult stage. In a discussion of the 

 relationships of the North American species a table or key 

 for the determination of these species is given, and also an 

 account of an interesting series of modifications of the 

 venation. The new species throw much light on what 

 has been a puzzling venational condition in the hitherto 

 known forms. There is also presented an account of 

 some of the interesting structural characters of the larvae 

 and imagines, especially those of the larval suckers, the 

 remarkable and suggestive condition of the compound eyes 

 of the adult, the imaginal mouth-parts, etc. There is given 

 also an account of the habits and life-history of the flies as 

 far as known, with an account of the local and continental 

 distribution of the North American species. Finally, a 



