654 Pomona College Journal op Entomology 



legs as against the forty-fivf in liniatus. Tlic antennae are typically smaller and 

 shorter. 



Found by the author to be very common during the wet season about Mon- 

 terey Bay. Also taken at Oroville (April. 1!)11). In both of these places it 

 a|)pears wliolly to re]ilace limatus. 



Family Arrupidae fam. nov. 



Differs from tlie preceding family (as represented in California) in having 

 the tliree divisions of the labrum, of which the median is larger, entirely unarmed; 

 in having the coxae of the second maxilla> entirely sejiarate; and in liaving the 

 mandible with but two pectinate lamellae. 



Verhoeff's superfamily name Placodesmata, proposed for the Mecistocepha- 

 lidae, may now, with better service, be employed to indicate the group formed 

 by this family and the Arrupidae. 



Genus Arrup gen. nov. 



Labrum strongly ehitinized, edges all smooth; the median piece broadly 

 triangular, witli the apex directed caudad. First maxillse with the outer branch 

 long, entire, membranous distad ; no lappets. Palpus of second maxilla? triarticu- 

 late. without a claw. Last ventral plate wide, triangular; coxopleural pores few, 

 small. Antcnn* thick, sub-filiform. First joint of prehensors with a large, 

 conical, strongly chitinized tooth; other joints unarmed. Anal legs unarmed. 



Type. — Arrup pylorus sp. nov. 



Arrup pylorus si>. nov. 



Attenuated cephalad, more strongly eaudad. Dorsum with a sharply im- 

 pressed longitudinal median sulcus. Fulvous in color ; head light reddish brown. 

 Head widest anteriorly, narrowed to caudal margin which is truncate ; anterior 

 margin extended forward from sides to middle. Antennae short, thick ; all 

 articles short, decreasing from basal ones to the penult; ultimate longer than the 

 two preceding taken together. Basal plate overlapped by the cephalic; exposed 

 portion very short, but little more than one-seventh as long as the cephalic, 4.8 

 limes wider than long. Spiracles all circular, the first very much larger than 

 tiie sicond. Last ventral plate wide, triangular, the sides converging caudad to 

 iiK ft at .111 .ingle. Coxojileural pores tliree or four on each side, small, adjacent 

 to edge of last ventral plate. .\nal legs in mali' erassate. Pairs of legs, forty-one. 

 Length, 22 mm. (tyjie). 



Localities. — .Sausalito and Berkeley (autiior. .Vpril. I'Ml). 



l"";unily Tampiyidae fam. ikiv. 

 Lalirum of one, uniformly chitinized piece, wliieli is (irmly co.ilesced with 

 the labrum exce|)ting at the ends wliere the suture may be detected ; median 

 portion conspicuously protuding, armed caudad with few stout teeth, the lateral 

 jiortions pectinate. First niaxillw with outer branch distinctly biarticulate, the 

 first article with a lappet, the apical joint thick, strongly bent inward and con- 

 tiguous with its fellow. Palpi of second niaxilliP triarticulate, ending in claws, 

 which are simjile, not toothed or pectinate. Prosternum with strongly developed 



