(>2n 



Hia.LETIN 'A, UNITED STATES NATIONAL MUSEUM. 



I/. 



' . Second pair of auteiiii;e a little lunger than half the length of the body. 

 First article of the tlagellum a little longer than the s-econd. 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 Metoprmodh as virgatus Budde-Lund. 



METOPONORTHUS SAUSSUREI Dollfus. 



MetojxntortliKs saii satire I Dollfus, Bull. Soc Zool. France, XXI, 1896, p. 48. 



Local if y. — Cordova, Mexico. 



Body oval, elongated, feebly and irreg-ularly 

 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 and a little di- 

 vergent. Terminal segment triangular, with 

 tlie 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. Coloi", l)rownish with light wav}' 



Fig. 673. — Metoponorthus 

 SAUSSUREI (After Doi.l- 

 Fus). a, First segment of 



THORAX, h. Seventh tho- spots; there are three little light spots at the 

 base of the terminal segment. Dimensions: 

 Length, 10 mm.(?) Width, 3i mm.« 



r.Alir SEGMENT, 

 AND UROPODA. 



ABDOMEN, 



«Tfie above description is adapted from the following one l)y Dollfus: 

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

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

 chaque cote 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, ii cotes incurves et a sommet obtus. ITropodes ^ base 

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

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

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

 longueur 10 millimetres? Largeur, 3 millimetres 5. — Dollfus, Bull. Soc. Zool. France, 

 XXI, 1896, p. 48. 



