19 i Ins, 
DIPTERA. 
XYLOPflAGIDiE. 
Xylophagus cinctus. Larva and pupa described from dead fir bark in 
Scotland. The larva feeds on larvae of other insects. The larva of 
X. ater also reared from birch bark, in company with the larva of Pyro- 
chroa. F. B. White ; Ent. M. M. xiii. pp. 160-162. 
TABANIDiE. 
C. K. Osten-Sacken, Mem. Best. Soc. ii. (Pt. 4, No. iv.) pp. 421-479, 
has completed his “ Prodrome of a Monograph of the Tabanidae of the 
United States ” [Zool. Bee. xii. p. 471] by a 2nd part, referring to the 
genus Tahanus^ with appendix and index to both parts. 102 species of 
Tahanm have boon described from N. America, North of Mexico, of 
which 34 are identified, 26 are sunk as synonyms, and 42 remain 
unknown. The author describes 20 species as now, and refers to others 
known to him but not described, from insufficient material. The impor- 
tance of a knowledge of the marked sexual differences is pointed out, the 
coloration of the eyes discussed as a valuable diagnostic character, and 
the presence of a more or less distinct ocelligerous tubercle on the vertex 
discovered to be highly useful in definition of natural relationship. The 
subgenus Therioplectes, proposed by Zeller for the species with pubescent 
eyes, is limited, so far as regards N. American species, to those also pos- 
sessing this tubercle more or less distinctly, the European T. riisticus 
andfulvus being also eliminated, and with others, forming a new sub- 
genus, Atylotus (infra). Some synonymy is suggested as to Wiede- 
mann’s, Walker’s, and Macquart’s species. T. ater, Wied., nec Pal. 
Beauv., is renamed wieclemanni, p. 455. 
In additions to part 1 of the “Prodrome” (pp. 474 & 475), some 
varieties of Chrysops puclicus, morosus (? = lagens^ Wied.), and frigidus 
are discussed. A list is also given of the 73 described Tahanidoi from 
Mexico, Central America, and the W. Indies, pp. 475-477, viz., Pangonia, 
14 spp., Lepidoselcega, 2 spp., Dlchelacera, 3 spp., Chrysops, 15 spp., and 
TahanuSy 39 spp. 
The following new genus, subgenus, and species are characterized : — 
Diaclilorus, p. 475, = Diabasis, O.-S., nec Hoffmanns. 
Atylotus^ subg. of Tabanus, p. 426. Eyes pubescent, no vestige of an 
ocellar tubercle ; frontal callosity wanting, or small and rudimentary ; 
difference in size between the large and small facets of the eyes in the g- 
considerable, with line of division very distinct; upper branch of ■ 3rd 
longitudinal vein knee-shaped at the base (emitting a stump of a vein in 
European species). For the European T. fulvus and o'usticus, also 2\ 
bicolor and reimuardtl, Wied., '1\ falvescens^ Walk., and T. cerastes^ p. 462, 
Kentucky, Wisconsin. 
Tabanus fronto, p. 431, Georgia, tectus, p. 436, Pennsylvania, Texas, 
&c., tener, p. 440, Georgia, Florida, orion, p. 442, Canada, Massachusetts, 
&c., actceon, p. 443, Canada, Minnesota, &c., cymatophorus^ Kentucky, 
venustus, Texas and Missouri, p. 444, psammophilus, Florida, nivosus, New 
Jersey, p. 445, vivax, p. 446, Maine, &c., longus, p. 447, Middle States, 
