PoMow Cni.i.r.Cth: .Idihnm. of F.ntomoi.oiiv 643 



Oribata humida n. sp. 

 (ri)juri- '212) 

 Length 59() to (527 niicrni. Color clu-stnut, polislicd. Alicloim-n with wings. 

 Mandiblr clu-lntc. I.aniillir iilndc-likc but nttai-hcd . ni'arly the wlioli- U-ngth 

 liluntly tapering to tip of riulinu'ntnry cusps. I.nnicllar hairs, rostrnl hnirs and 

 iiitcrlaiiifllar hairs stont, pectinate. Teetopcdiinn hhmt anteriorly. Translamella 

 .1 mere line running between the lamella- just Imck of tips of cus])s. Pseudostigniatie 

 organ slender, slightly fusiform, ;ind uniforndy pi'ctinate. The suture marking 

 the anterior edge of abdomen with two notches near tlic median line. Abdomen 

 li.'iirless, almost as broad just behind the wings as long, and roundly pointed 

 posteriorly. Wings extending nearly to rostrum and rounded anteriorly. Legs 

 slender, rather thickly set with luiirs, most of them (inely pectinate. One simple 

 bristle at dist.al end of e.ach peiudtiniate joint. I'nguis tridactyle. Several speci- 

 mens under board near hydrant, I.aguna Bcieh. 



Key to near relatives oi O. alata 



1. .V distinct suture on dorsum between ceplialothorax and abdomen. 2 

 No suture on dorsum between ceplialothorax and abdomen. 4 



2. Pseudostigniatie organ short, clavate, length ()()() niicrm. O. alata 

 Pseudostigniatie organ with long recurved jieduncle and fusiform head. .S 

 Dorsum of .•ilidomeii witli fine longitiidiii.-il wrinkles, lingtli S.'iO mierni. 



0. rugifroiis 

 Dorsum of abdomen plain. O. dorxalit 



1. I'seiidostigmatic organ setiform. O. netiformis illall) 



Pseudostigmatie organ with long sleiidir peduiielc- .md gradually clavate 



head. O. alata var. califorv'trn 



Oribata alata \;ii. californica n. \ar. 

 (l-'igure 213) 

 Length t"! mierni. Color black. )iolislied. .\bdomi-n globular, with wings. 

 .Mandible chelate. No lamella. Dorsal covering extends forward to rostrum 

 without break. Hostrid hairs pectinate. No translamella. Interlamellar hairs 

 not a|iparent. Pseudostigm.'itie organ straight with a long, thin peduncle and 

 gradii.'illy clavate head which bears a few short spines on the distal end. .\bdonien 

 smooth, hairless jind almost as broad behind the wings as three-fourths the length 

 of body, ^^'ings project forward .almost to tip of rostrum and are rounded 

 anteriorly .is shown by the right wing. The other wing shows the normal position 

 .'iiid ajijiearanee, and as the species are divided on whether the wings are pointed 

 or rounded anteriorly, this instance shows the care which must be taken in 

 determination, even when seemingly definite and non-confusible characters are 

 Used. The wings ;ire tr.ansversely sculptured. Legs sparsi'ly clothed with 

 pectinate hairs and a long simple bristle projects from the end of penultimate 

 joint of leg one. the two bristles almost meeting in front of rostrum. L'ng^is 

 heterodaelyle. the middle claw being the heavii-st and o|iposed to the others as 



