598 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



104. Genus LTPROBIUS Budde-Lund/' 



Boch^ not convex, scarcely contractile. Head produced into lobes 

 at the side; front not produced in the middle, marginate. Epimera 

 of the third, fourth, and fifth segments of the abdomen large. 



Peduncle of the uropoda short and wide, with the outer side sulcate. 



Epimera of the thoracic segments moderateh' large; those of the 

 first three segments with the posterior angles roundly obtuse, those 

 of the fourth segment with the posterior angles straight, and those of 

 the three posterior segments with the posterior angles acute. 



Body setigerous, scarcely granulated. 



Flagellum of second antenna^ composed of three articles. 



LYPROBIUS PUSILLUS Budde-Lund. 



Li/probius pusillus Budde-Lund, Crust. Isop. Terrestria, 1885, p. 230. — Richard- 

 son, Proc. U. S. Nat. Mus., XXI, 1899, p. 864; Ann. Mag. Nat. Hist. (7), 

 IV, 1899, p. 333; American Naturalist, XXXIV, 1900, p. 305. 



Locality. — California. 



Body oval, rather convex, smooth, punctate, very minutely setiger- 

 ous, especially so posteriorly. 



Second pair of antennae a little shorter than half the length of the 

 body; first article of the flagellum equal in length to the third, almost 

 half as long as the second. 



Antero-lateral lobes small, rounded. Front, with the median mar- 

 ginal line entire, a little arched and produced. 



The terminal segment of the abdomen is triangulate in the middle, 

 produced, and extends a little beyond the epimera of the fifth abdom- 

 inal segment; terminal segment a little excavate above. 



Color luiiforml}" brown, transparent on the margins, white. 



Length 5 mm. Width 2.5 mm. Height 1.2 mm.^ 



lOS. Genus SYNUROPUS Richardson. 



Body oval, not contractile into a ball, with the segments laterally 

 expanded, as in Onl)<eus. 



Head with lateral and frontal lobes. Second pair of antennae long, 

 with flagellum composed of three articles. 



o For characters of genus see Budde-Lund, Crust. Isop. Terrestria, 1885, pp. 229-230. 



^Tlie above description is adapted from the following one of Budde-Lund's: 



Ovalis, convexiusculus, sublfevis, punctatus, minutissinie pra^sertim post setiger. 



Antennae exteriores corpore dimidio jiaulo breviores; flagelli articulus primus 

 tertio pequalis, secundo fere dnplo brevior. 



Lobi frontales laterales parvi, rotundati. Frons media linea marginali Integra 

 paulum curvate producta. 



Caudie annulus anaiis medio triangulo, producto, epimera annuli prteanalis paulum 

 superante, supra paulum excavatus. 



Color uniformis brunneus, in marginibus jierlucens, albidus. 



Longitudo 5 mm., latitudo 2, 5 mm., altitudo 1, 2 mm. — Budde-Lund, Crust. 

 Isop. Terrestria, 1885, p. 230. 



