030 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



METOPONORTHUS VIRGATUS Budde-Lund. 



Metoponorthus virgatus BUDDE-LUND, Crust. Isop. Terrestria, 1885, p. 182. RICH- 

 ARDSON, American Naturalist, XXXIV, 1900, p. 303; Proc. U. S. Nat. Mus., 

 XXIII, 1901, p. 569. 



Localities. Florida; Nova Aurelia. 



Body oblong oval, convex, smooth or obscurely and finely granu- 

 lated and tuberculated. 



Inner face of the right mandible furnished with four plumose 

 processes, of the left mandible with five. 



Second pair of antennas equal to half the length of the body; the 

 first article of the flagellum is shorter than the second. 



Antero-lateral lobes of the head small, rounded; median lobe very 

 small, widely rounded; epistome slightly convex, smooth. The termi- 

 nal abdominal segment is short, triangular, with the sides straight; it 

 is flat above, scarcely excavated. 



Color grayish black; there are white tubercles in the middle of the 

 thorax and white spots arranged in three longitudinal lines. 



The epimera of the thorax are furnished with a shining tubercle dis- 

 tant from the margin. The legs are spotted with black, thickest on 

 the coxae. 



Length 9-10 mm. Width 4, 5-5 mm. Height 2-2, 2 mm. 



112. Genus RHYSCOTUS Budde-Lund.& 



Body rather convex, very little or scarcely at all contractile. 



Second pair of antennae long; flagellum composed of two articles, 

 the first article shorter than the second. Eyes moderately large. 

 Frontal marginal line bent downward before the eyes on either side, 

 coming in contact with the vertical marginal line back of the eyes, 

 passing through the pleurae of the head and surrounding the inconspic- 



a The above description is adapted from the following one of Budde-Lund's: 

 Oblonge ovalis, convexus, sublaevis vel obscure et tenuiter granulatus et tubercu- 

 latus. 



Mala interior mandibulse dextrse penicillis 4, mandibulse sinistrse 5. 



Antennae exteriores corpus dimidium sequantes; flagelli articulus prior altero 

 brevior. 



Lobi fron tales laterales parvi, rotundati; lobus medius minimus, late rotundatus; 

 epistoma leviter convexum, laeve. 



Caudse annulus analis brevis, triangulus, lateribus subrectis, supra planus, vix 

 excavatus. 



Color ex griseo niger; in medio trunco tubercula alba et maculae albidse in lineas 

 tres longitudinales condensatoe. Trunci epimera tuberculo perlucente a margine 

 paulum distante munita. Pedes, maxima in coxis, nigromaculati. 



Longitude 9-10 mm.; latitude 4, 5-5 mm. Altitude 2-2, 2 mm. BUDDE-LUND, 

 Crust. Isop. Terrestria, 1885, p. 182. 



6 See Budde-Lund for characters of genus, Crustacea Isopoda Terrestria, 1885, pp. 

 191-192. 



