68 
Psyche 
[June 
NOTES ON HIPPOBOSCIDAE 
4. On the Larger Species of LYNCHIA Weyenbergh 
( OLFERSIA of Authors; ICOSTA Speiser; 
ORNITHOPONUS Aldrich) 
By J. Bequaert 
Department of Tropical Medicine, 
Harvard Medical School, Boston, Mass. 
On size alone, most of the species of Lynchia may be di- 
vided rather readily into two groups. Although this ar- 
rangement disregards true relationship, I shall use it for 
the purpose of this paper, which discusses only the larger 
forms of the genus. These are 10 mm. or more in length, 
as measured from the tip of the fronto-clypeus to the tips 
of the folded wings. The length of the wing, a much more 
reliable standard, varies from 6 to 8.5 mm. in the specimens 
I have seen. L. pilosa (Macquart) is the smallest member of 
the group known to me. L. penelope Weyenbergh, the un- 
recognized genotype, also belongs to this group. 
I have seen specimens of the six species included in the 
subjoined key. Having studied much material, I am in- 
clined to regard most of the other names proposed for large 
Lynchise, as synonyms and I have attempted to treat them 
accordingly. In many cases the identity of these names 
must remain open to question, until the original specimens 
can be examined. I have seen the types of Hippohosca bu- 
bonis Packard and Hippobosca nigra Perty only. 
1. Mesonotum and scutellum covered fairly uniformly with 
soft, short hairs, directed backward; scutellum with- 
out median groove. Frons very wide, with the sides 
distinctly converging below ; postvertex very short and 
wide, about one-fourth of the length of the medio-ver- 
tex; inner orbital bristles of frons very numerous, in 
several irregular rows; palpi short, slightly shorter 
