PROCEEDINGS OF THE NATIONAL MUSEUM. 



Fig. 6.— Tecticeps convexus 

 domen of female. x -1 



TECTICEPS CONVEXUS Richardson. 



Tectivc'pi< coiirexus Kichakd.sox, I'roc. I". S. Nat. Mus., XXI, 1899, pp. <S37-838, fig. 

 15; Anil. Mag. Xat. Hist. (7), IV, 1899, pp. 181-183; American Naturalist, 

 XXXIV, 1900, p. 223; Bull. U.S. Nat. Mus., No. 54, 1905, pp. 278-280, figs. 

 290-291. 



Lovalitij. — Monterey Buy, California. 



Depth. — 30 feet, in sand}' mud. 

 U. S. National Museum collection. 

 The body i.'^ oval and some\yhat flattened. 

 The surface is smooth. The color is light 

 yellow, with markings of ))rown. 



The head has the anterior mai-gin much 

 ])roader than the posterior margin, and pro- 

 duced in front, but not wholly concealing 

 the basal articles of the tirst pair of attenn^, 

 and somewhat raised, forming two small 

 convex elevations. The antero-lateral mar- 

 gin is likewise produced, forming an acute angular projection, which 

 extends in a lateral direction beyond the post-4ateral margin of the 

 head. The eyes are dorsally situated in a median transverse line in 

 both sexes. The tirst pair of antenuiv, with a flagellum of K! articles, 

 extend to the posterior angle of the third tho- 

 racic segment. The second pair of antenna?, 

 with a flagellum of 13 articles, extend to the 

 middle of the fourth thoracic segment and 

 exceed by one article 

 the length of the flrst 

 pair of antenute. Both 

 pairs of antennae are 

 disposed to lie con- 

 cealed under the broad 

 epimeral plates of the 

 thoracic segments. 



The thoracic seg- 

 ments are su))equal in 

 length. The flrst seg- 

 ment has its antero-lateral angles produced 

 around the anterior portion of the head, form- 

 ing a broad plate at the side of the segment. 

 The epimera are almost twice as broad as long; 

 those of the fifth segment extend downward, 

 with the anterior margin straight, making the 

 length and breadth about equal and forming almost square epimera; 

 in the epimera of the sixth and seventh segments the anterior margins 

 are in the same direction as the posterior margins, which extend 

 downward. 



Fig. 7.— Tecticeps convexus. 

 a, Head, x 5i. 6, Abdomen 



AND LAST THORACIC SEG- 

 MENT. X '1%. 



Fig. 8.— Tecticeps convexis 

 Seventh leg of male. :< 4|. 



