ISOPODS OF NORTH AMERICA, 595 



Color of the dor.siil .surface reddish or dai'k gray, the frontal lol)es, 

 especially the middle one, and a longitudinal band on the thorax 

 darker and covered with very niunerous paler oblong spots." 



ALLONISCUS CORNUTUS Budde-Lund. 



Alloniscus corntUus Budde-Lund, Crust. Isop. Terrestria, 1885, pp. 228-229. — 

 Richardson, Proc-. U. S. Nat. Mus., XXI, 1899, p. 864; Ann. Mag. Nat. 

 Hist. (7), IV, 1899, p. 332; American Naturalist, XXXIV, 1900, p. 305. 



Localih/. — Cal if oi'ina. 



Body short, oval, subconvex, obscurely but densely roug'hened and 

 thickly punctate and setigerous. Second pair of antenna; shorter than 

 half the length of the body (7:17); flagelluni shorter than the tifth 

 article of the peduncle; the second article of the tlagellum shortest, 

 the tirst equal in length to the third. 



Antero-lateral processes lai'ge, narrow, prominent, subconical; front 

 in the middle very much swollen. 



The first thi'ee segments of the thorax have the posterior margin on 

 both sides slightly sinuated; all the following segments have the poste- 

 rior margin in the middle rather sinuated posteriorly. 



«The above description is adapted from the following one of Stuxberg's: 



Rhinoryctes ovalis, longitudine duplo majore quam latitudine, convexus, densis- 

 sime granulatus, epimeris margine serratis. 



Antennte exteriores corporis latitudine multo breviores ( = 85:100); pedunculi 

 articulus quintus longissimus, jjarum curvatus, longitudine flagellum 3 : articulatum 

 ;equans; flagelli articuli inter se eadem longitudine vel medius interdum minimus. 



Oculi, ocellis congregatis, prominentes, sul>circulares. 



Lobus frontalis medius magnus, productus, obtusus, sursum porrectus, quartam 

 partem latitudinis capitis ;equans; lol)i laterales producti, conici, antice rotundati, 

 longitudine oculos tequantes. 



Trunci segmenta omnia margine postico medio sinuata. Epimera mediocria, 

 angulis anticis post sensim magis rotundatis, serratis, angulis posticis parum retro- 

 versis, rotundate-acuminatis. 



Cauda subcircularis, latitudine paullo majore quam longitudine, omnium seg- 

 mentorum longitudine a-quali, epimeris segmentorum primi et secundi evanescenti- 

 bus, tertii, quarti, quinti maximis, retroversis, margine exteriore rotundatis, serratis, 

 interiore fere rectis. Segmentum ultimum trigonum, duplo latins quam longius, 

 marginibus posticis rectis, rotundate-acuminatum, suj^ra convexiusculinu et inter- 

 dum fovea longitudinali hand profunda instructum. 



Pedum ultimi paris articulus basalis fere fvque latus ac longus, depressus, margine 

 postico-laterali parum elevato, circulariter rotundato, serrato, appendix exterior 

 pauUum comi)lanata, subconica, margine exteriore recto, interiore convexo, longi- 

 tudine appendicem interiorem hand multo superans, ([luc ultimum caud;e segmentum 

 parum excedit. 



Color dorsi rufo-vel fusco-griseus, lobis frontalibus, pra\sertim medio, vittaque 

 trunci longitudinali nigriori})us, maculis oblongis numerosissimis pallidioribus 

 inspersis. 



Longitudo, 10 mm.; latitudo, 4.5-5 mm.; altitudo, 2.3-2.5 mm. — Stuxberg, 0fvers. 

 Vet. Akad. Forhandl., 1875, No. 2, p. 51. 



