I80P0DS OF NORTH AMERICA. 



()*>1 



a narrow dark colored, dentate cnttiny edge, hut no palp. First max- 

 illae with the inner plate short and furnished with three short ciliated 

 seta?, the upper one much shorter than the lower two, which are of 

 su.])e(iual length; outer plate narrow and armed with five curved teeth. 

 Second raaxilhe narrow, with two very small ciliated plates on the 

 inner maro-in near the rounded tip. Inner plate of the maxillipeds 

 with several short, densely ciliated processes on the transverse distal 

 margin and a large ciliated seta on the inner side; palp ii\ e-jointed, 

 the terminal joint minute. 



'"■ Legs very spiny below; dactyls short, furnisluMl with several setffi 

 and one or two spines below, near the tip. I'ropods slender, fully 



Fig. 732.— LiGiDifM (jRACiLis (After Holmes), a, Maxii.uped. b. General figure, c, First leg. 



one-half the leng-th of the abdomen; peduncle oblotig, flattened, the 

 inner angle strongly produced backward; rami slender, microscop- 

 ically scabrous but devoid of spines; inner ranms exceeding the outer 

 in length, but slightly moi'c slender, the tip furnished with seta\ 



"The body is furnished with scattered tine short hairs, which are 

 more conspicuous on the posterior marg'ins of the segments. 



"'Length ^\ inch." —Holmes." 



«The above description i.M quoted from Proc. Cal. Acad. Sci., {'^), III, 1904, p. 818, 

 and is made originally from the three ty])e specimens of Alloniscus rnacniosns Harford, 

 which Mr. Holmes identities with Stj/lonisniK graciliii Dana, the description of which 

 follows: 



Corpus gracile. Abdomen paulo oblongum, su])ovatum, thorace postico subito 

 paululo angustius, segmentis 3 tio, 4 to, 5 toque hinati.s. Styli caudalis basis brevis, 

 vix duple longior quam latus, extus ad medium subito angustior. Antenn;e externa' 

 fere nuda', flagello ferine 14 articulato, nudo, articuios l)asis duos precedentes longi- 

 tudine fere lequante. — Long. 5 mm. 



As in other species of this genus, tiie outer anteiuiir have not tlu' double genicu- 

 iation characterizing the ()niscid;e. The surface of tiie body is smooth; yet there 

 are a few exceedingly minute hairs, especially along the posterior margin of the seg- 

 ments of tlie abdomen. The branches of the caudal stylets in tiie specimen are 

 mutilated.— Dana, Proc. Acad. Nat. Sci. Phila., VII, 1854-55, p. 17(3. 



