819 A. E. Verrill—The Bermuda Islands. 407 
have four long, pale wing-pads, which are nearly equal; the females 
have but two. Larve yellowish white and light yellow. 
A few males were found ; these have two pairs of wings, which 
exceed the body by about one-third of their length ; the two pairs 
are nearly equal in length and of nearly the same form, but the under 
wings are transparent, without color markings, and more evenly 
rounded distally ; the median vein of the latter divides near the 
middle into four branches, of which the distal branch forks once; 
the fore wings have the brown markings lighter than in the female, 
195 
Figure 192a.—Heteropsocus dispar V.; wings of male, more enlarged. Figure 
193.—Louse of tropic-bird; x 61g; 195a, the same, dark variety; x6. From 
drawings by A. H. V. 
and interrupted in the middle, the distal part forming an irregularly 
stellate or palmate spot, with a veinlet along the middle of each 
lobe ; the three distal branches are bifurcated. Abdominal append- 
ages short, tapered, incurved, hairy, close together; ocelli three, in a 
triangle between eyes. Length, 1.25™". 
The Book-louse (Atropos divinatoria) is common. Fig. 194. 
1.—Mallophaga ; Bird Lice. Doubtless numerous species occur on 
poultry, and on the various wild birds that visit Bermuda, but they 
have not been collected hitherto.* 
Tropic-bird Louse. (Trinoton luridum Nitz.) Figure 193, 193a. 
I am indebted to my son, Mr. A. H. Verrill, for several specimens 
of this large species, from the Bermuda Tropic-bird. The thorax is 
dark brown or black, the sutures bordered with yellow, and each 
* Numerous American species are described and figured by Prof. F. V. Kellogg, 
in Proce. Calif. Acad. Sciences, vol. vi, pp. 31-168, 431-548, 28 plates, 1896 ; 
Occas. Papers Calif. Acad., vi, pp. 1-224, 17 pl., 1899; Journ. N. York Entom. 
Soc., x, p. 20; List of North American Mallophaga, Proc. U. S. Nat. Mus., xxii, 
pp. 39-100, 1899. See also Osborn, Bull. U. S. Nat. Mus., No. 7. 
