626 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



''. Second pair of antenme a little longer than half the length of the body. 

 First article of the flagellurn a little longer than the second. Inner face of 

 the mandibles with three to four penicils. Terminal segment of abdomen 

 a little excavate above. Color yellow or brown or dark, almost black, with 

 obscure or yellowish spots arranged in from four to six longitudinal series, 

 the first two lateral Metoponorthus sexfasciatus ( Koch ) 



. Epistome smooth Wetoponorthm virgatus Budde-Lund. 



METOPONORTHUS SAUSSUREI Dollfus. 



Metoponorthita saussurei DOLLFUS, Bull. Soc. Zool. France, XXI, 1896, p. 48. 



Locality. Cordova, Mexico. 



Body oval, elongated, feebly and irregularly 

 granulated; each segment of the abdomen has 

 a posterior depression and the first segments 

 are furnished on each side with a little pearl- 

 like granulation. 



Head(?) Thorax: The first segment has the 

 posterior margin almost straight and not sinu- 

 ated. Abdomen a little narrower; the lateral 

 processes of the third to the fifth abdominal 

 segments are well developed d"nd a little di- 

 vergent. Terminal segment triangular, with 

 the sides incurved and obtuse at the apex. 

 Uropoda with the basal segment reaching 

 the apex of the terminal abdominal segment; 

 inner and outer branches very much elon- 

 gated, the former being linear, the latter lan- 

 ceolate. Color, brow r nish with light wavy 

 spots; there are three little light spots at the 

 base of the terminal segment. Dimensions: 

 Length, 10 mm.(?) Width, 3 mm. a 



The above description is adapted from the following one by Dollfus: 

 Corps ovale, allonge, faiblement et irregulierement granule; chaque segment du 

 pleon prsente une depression posterieure et les premiers segments sont munis de 

 chaque cot d'une petite granulation perliforme. Cephalon? Pereion=le premier 

 segment a le bord posterieur presque droit et non sinueux. Pleon peu retreci; les 

 processus lateraux des segments 3 a 5 du pleon sont bien developpes et un peu diver- 

 gents. Pleotelson triangulaire, a cotes incurves et A. sommet obtus. Uropodes a base 

 atteignant le sommet du pleotelson; endopodites et exopodites tres allonges, les pre- 

 miers lineaires et les seconds lanceoles. Couleur=brunatre avec des marbrures et 

 taches claires; trois petites laches claires Jt la base du pleotelson. Dimension= 

 longueur 10 millimetres? Largeur, 3 millimetres . DOLLFUS, Bull. Soc. Zool. France, 

 XXI, 1896, p. 48. 



FIG. 673. METOPONORTHUS 

 SAUSSUREI (AFTER DOLL- 

 FUS). O, FIRST SEGMENT OF 



THORAX, b, SEVENTH THO- 

 RACIC SEGMENT, ABDOMEN, 

 AND UROPODA. 



