318 AMERICAN APTERA. 



Female. — Body, length 2.34 mm.; width .56 mm.; pale, with strong lateral 

 bands and light brown narrow segmental transverse blotches; differing from 

 signatus and biciispis hy not having the dorsum mostly brown. Head, letigth .6 

 mm.; width .45 mm.; elongate, clypeus expanded anteriorly in a thin trans- 

 parent portion with flatly rounded margin, clypeal signature weak, clypeal 

 sutures distinct, two hairs at suture, one in front of suture and one behind ; tra- 

 beculffi distinct, although small; temporal margins flatly convex with two long- 

 ish hairs; lateral margins of head sharply narrowly blackish brown ; no occipital 

 signature; antennae with segment 2 longest segment 3 nearly as long, and 5 a 

 little longer than 4, uncolored. Prothorax nearly square, lateral margins weakly 

 concave in median part, one small hair in each posterior angle; metathorax pen- 

 tangular with lateral margins slightly concave in middle, the two posterior sides 

 meeting by a flatly rounded obtuse angle, six pustulated hairs in each postero- 

 lateral angle, two of these hairs longest and set in a common pustule, lateral mar- 

 gins narrowly but strongly blackish brown. Legs almost uncolored, except for 

 pale smoky brown tinge on tibiae and tarsi. Abdomen fairly slender, with flatly 

 convex sides, with two to three longish weak hairs in the postero-lateral segmen- 

 tal angles, and the margins narrowly but strongly blackish brown, and rather 

 incomplete narrow pale brown transverse blotches across the posterior margin of 

 each segment; these transversal linear blotcnes have each a small triangular ex- 

 pansion in the middle; last abdominal segment markedly two-pointed although 

 these points are not long. 



Male. — Body, length 1.84 mm.; width .5 mm.; head, length .56 mm.; width 

 .41 mm.; on abdomen a brown suffusion over most of segments 3-6; on segment 

 8 this brown is in the form of two distinct lateral blotches tapering toward the 

 median line of the body and not quite meeting, on segment 9 the brown extends 

 clear across as a strong transverse blotch ; posterior margin of last segment 

 rounded, brown, and bearing several longish weak hairs. 



N. fuscus Nitzch, Giebel, Zeitsch. f. ges. Naturw., vol. xvii, p. 523. 1861. 

 From Buteo galapagcensis, new host record (Bindloe Id.). 



Bf. fuscuiiiarginatns Denny, Anoplur. Brit., p. 136, pi. 10. fig. 1, 1842. 

 From Nesomimus parvulus, new host-record (Indefatigable Id.). 



Genus I.IPEURUS. 

 liipeiiriis ferox Giebel, Zeitsch. f. ges. Naturw., vol. xxix, p. 195, 1867. 

 From Diomedea nigripes (16° N. 114° W., Clarion Id.). 



li. confident Kell., New Mall.. Ill, p. 26, pi. 3, fig. 1, 1899. 

 From Diomedea nigripes (Clarion Id.). 



L.. diversiis Kell., New Mall., i, p. 123. pi. 8, figs. 3 and 4, 1896. 



From Puffinus obscurus subalaris (Culj^epper Id.), Anoiis stolidu.^ 

 galapagcensis (Culpepper Id.), Fubnarus sp. (13° N. 103° ? W.), 

 ^^strelata phceopygia, new record (13° N. 103o ? W.). 



