Osten Sacken.] 184 [October 6, 



and deposited the collection, for future reference, among the exotic 

 Diptera of the Museum of Comparative Zoology. Most of these 

 specimens are forms which are almost identical in all parts of the 

 world. Some of them, however, are characteristic enough to indi- 

 cate at some future time the affinities of the fauna. Such are, for 

 instance, Tipula (No. 1 of the list) ; Syrphus (No. 4) ; Lispe (No. 5); 

 perhaps also the % No. 9. Unfortunately, our meagre collections 

 of Diptera from the Pacific coast prevent me from attempting a 

 comparison at present. Among the few insects of other orders, 

 however, in the same collection, there was a Hemerobius, which Dr. 

 Hagen was able to identify as Micromus (Berotha) Jfcwicomis Walker, 

 a species also received from Pennsylvania, Georgia and Kentucky. 



The collection was divided in two lots, dated March 20 and April 

 22. Many of the- species occurred in both lots.. 



List of the Specimens. 



1. Tipula, cT, of the ordinary type of the Tipulce lunatce, and 

 with peculiar brush-like appendages of the hypopygium; two females, 

 although somewhat darker in color, probably belong to the same spe- 

 cies. (One specimen, March 20, another, and the females, April 22.) 



2. Bibio, <?, small, black, with whitish pile ; a single specimen 

 (March 20). 



3. Tachytreehus, ?. A single specimen (April 22), appar- 

 ently belonging to this genus. 



4. Syrphus, of the group of S. affi.nis Say, or S. lapponicus Zett. 

 Five specimens of very different sizes, but apparently of the same 

 species (April 22). 



5. Lispe, one specimen (April 22). 



6. Musca domestica, several specimens (both dates). 



7. Lucilia sp., several specimens (id.}. 



8. Sarcophaga, two specimens (March 20). 



9. " another species (March 20). 



10. Anthomyise,, several specimens (March 20). 



11. Drosophila (?), antennae broken (March 20). 



12. Scatella, numerous specimens (March 20). 



Of other orders, I found in the lot the above-mentioned Hemero- 

 bius, Psocus, Aphis (Lachnus?), Psylla (Trioza?), Ophion. 



