Ixxx 



Supplement, with notices of fifty-eight species of uncertain genera, 

 and by an excellent index of the plates and a systematic catalogue 

 and full alphabetical indices of all the genera and species described 

 in the various divisions of his memoir. 



DiPTERA. 



The Baron C. R. Osten-Sacken has enriched Dipterology with a 

 valuable contribution to the * Bulletin of the Geological and Geo- 

 graphical Survey of the United States' (vol.iii. No. 2, Washington, 

 April, 1877, pp. 165), containing descriptions of the Diptera of the 

 Region of North America west of the Mississippi, and especially 

 from California, collected by the author himself. These countries 

 seem especially rich in Bomb yliidce and Asilida, and notes on the 

 general geographical distribution of these and other groups are 

 given in the course of the work, to which is also added an Appendix, 

 containing a more general notice of the geographical distribution of 

 the Diptera. A great number of new species are described, not 

 more than fifty having been previously published. 



A fine volume entitled ' Diptera Neerlandica,' illustrated with 

 fourteen plates, has been published by Van der Wulp (large 8vo, 

 1877). 



Microcephalus is the generic name (already preoccupied in 

 Entomology) given by Schnabl to a new QEstrideous insect from 

 Western Siberia, allied to Hypoderma, a description of which is 

 published in the ' Deutsche Entomol. Zeitsch.' for 1877. Nothing 

 is recorded of the habits of the insect. 



Myzostomata. 

 The limits of the great division of the Articulata are gradually 

 extending, in consequence of the minute attention bestowed on 

 various hitherto obscure groups. In addition to the Tardigrada^ 

 Pentastomata, Linguatulina, and Peripattis (so excellently worked 

 out by Mr. Moseley, zoologist of the ' Challenger' Expedition), we 

 must now include the Myzostomata, which have been elaborated 

 by Dr. L. Graff, in a fine folio monograph, with eleven plates, 

 entitled ^' Das genus Myzosfoma" These are small animals 

 parasitic upon Comatula and other Mediterranean Crinoidea, with 

 oval or circular slightly convex bodies, with lateral appendages of 

 varied form, and five pairs of very short-jointed legs, each termi- 

 nated by a single retractive claw. The mouth is a porrected fleshy 



