468 KELLOGG AND KUWANA 



7iosa from Albemarle and South Seymour ; Camarhynchus affinis from 

 Albemarle ; Progtie modesta from Albemarle and Nesomimus car- 

 ringtoni from Barrington. 



A strikingly marked form showing some relation to the nigripicti 

 group common on terns. 



Male. — Body, length 1.9 mm., width .45 mm.; color pale with 

 broad dark brown margin ; medial blotches of abdomen dark brown. 

 Head large and elongate, length .61 mm., width .41 mm. ; elongate 

 conical, with narrow, rounding clypeal front slightly emarginated, and 

 five marginal hairs, one in the rounding, anterior angle, one just be- 

 hind this, one at suture, and two before the trabeculae ; trabeculag dis- 

 tinct, rather stout ; antennae short, not reaching the occipital margin 

 when projected backward, segment 3 longest, segments 3, 4 and 5 sub- 

 equal ; last two segments colored ; eyes pi^ominent, with a longish hair 

 and a prickle ; temporal margins flatly rounded, with two long hairs 

 and two prickles ; occipital margin nearly straight ; uncolored front of 

 clypeus very narrow ; signature large, shield-shaped, anterior region 

 dark brown, posterior end not extended to the mandibles ; antennal 

 bands distinct, blackish-brown, interrupted by suture, the part behind 

 the suture curving, with anterior extremity expanded ; temples bor- 

 dered with dark brown ; ground color dark brown. Prothorax quad- 

 rangular, with posterior angles nearly rectangular, with one longish 

 hair ; lateral margin with strong dark brown even border, which bends 

 inward on the posterior angle. Metathorax pentagonal, angulated on 

 abdomen ; lateral angles with five pustulated hairs ; lateral margin with 

 dark brown border. Legs pale brown with darkish-brown marginal 

 blotches. Abdomen elongate elliptical, with posterior angle project- 

 ing and two or three longish hairs on dorsal surface ; segments i to 2 

 with triangular medial blotch, segments 3 to 6 entii'ely brown, seg- 

 ments 7 to 8 pale, segments i to 8 with distinct narrow lateral black 

 bands ; posterior margin of last segment rounded with several pustu- 

 lated hairs. Genitalia showing through segments. 



J^emale. — Body, length 3.28 mm., width .51 mm.; head, length 

 .68 mm. width .45 mm. ; color pale with distinct dark brown margins, 

 and distinct medial blotches which do not cover entire surface as in the 

 case of male ; last segment angularly emarginated without terminal 

 hair. 



NIRMUS OBTUSUS sp. nov. 



(PI. XXIX, fig. 2.) 



A female from Sterna fuligitzosa from Clipperton. Differs from 

 iV. hebes Kellogg on Sterna maxima from Monterey Bay, Califor- 



