PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXI. 



Fig. 1.— Tecticeps ala.s 

 cEN.sis. Male, x '1\. 



TECTICEPS ALASCENSIS Richardson. 



Tecticeps alascensls Eichard.sox, Proc. Biol. Soc. Washington, XI, 1897, pp. 

 181-183, figs. 9-12; Proc. U. S. Nat. Mus., XXI, 1899, p. 837; Ann. Mag. 

 Nat. Hist. (7), IV, 1899, p. 181; Bull. U. S. Nat. Mus., No. 54, 1905, pp. 

 276-278, figs. 286-289. 



Localities. — North of Aiiiak Island; off Cape Menchikoff; south of 

 Ha^emeister Island; North Head, Akutan Island; 

 off Bristol Ba3'; Alutian Islands, off Unimak Island; 

 Kamchatka; off .Stiirup Island, Kitrile Islands, 

 Okhotsk Sea; latitude 60^ 16' north, long-itude 167^ 

 41' west; Bering Sea, west of Pribiloff Islands, 

 between Pinnacle and Ulakhla, Unalaska; Bering 

 Sea, off' Nunivak Island, 

 Dej>th . —0-106 fathoms. 

 U. S. National Museum collection. 

 The outline of the body is oval. The surface is 

 quite smooth, but covered with little points of de- 

 pression. Length 16 mm.; width 10 mm. 



The head is large, twice as long as any one of the 

 thoracic segments. The anterior margin is produced in a wa}^ to con- 

 ceal the antenna?, as are also the ahtero-lateral margins, making the 

 anterior portion of the head in front of the eyes much broader than 

 the posterior portion, and forming very acute antero- 

 lateral angles. This frontal margin forms a very broad 

 obtuse angle with its apex in the median line. On either 

 side of this apex to the antero-lateral angle this portion 

 of the head is somewhat depressed. The antennae are 

 not conspicuous, lying concealed beneath the frontal 

 margin of the head. The first pair extend to the pos- 

 terior angle of the first thoracic segment; the flagellum 

 is composed of ten articles. The second pair reach the 

 middle of the second segment; the flagellum consists of 

 twelve articles. The eyes are dorsally situated on the posterior half 

 of the head in both sexes. 



The thoracic segments are about equal in length. 

 The first one extends laterally around the posterior 

 portion of the head, forming a broad plate at the 

 side of the segment. The epimera of all the seg- 

 ments are about twice as broad as long, with the 

 exception of those of the fifth segment, which are 

 nearl}^ square and verj^ conspicuous. 

 The first segment of the abdomen has three su- 

 ture lines, and its posterior margin projects down at the sides over 

 the terminal segment. The terminal segment is triangular and has 



Fig. 2.— Tecticeps 



ALASCENSIS. a, 



Mandible. 6, 

 Mandibular AP- 

 PENDAGE. X 5f. 



Oli^^:^^ 



Fig. 3.— Tecticeps alas- 

 CENSis. a, Antenna 

 OF first pair, b, An- 

 tenna OF second pair. 

 X5|. 



