PoMONV CoI.I,K(;F. Joi'HNM. OF FntOMOLOGV 643 



Oribata humida ii. sp. 

 (Figure 212) 

 T.cngtii .i.Ofi to (r>7 niicrni. Color cliestnut, jiolislicd. AbdoiiK^n with wings. 

 Mandililc cliclalc. l.,imillii' hl.idt-like but atlaclicd nearly the whole length 

 bluntly tajx'ring to ti|) of rudinicntary cusps. Lamellar hairs, rostral hairs and 

 iijterlanicllar liairs stout, jiectinate. Tectopcdiuni blunt anteriorly. Translamella 

 a mere line running between the lanielbe just baek of tips of eusps. Pseudostigmatic 

 organ slender, slightly fusiform, and uniformly peetinate. The suture marking 

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

 hairless, almost as broad just behind the wings as long, and roundly pointed 

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

 slender, rather tiiickly set with hairs, most of them finely pectinate. One simple 

 bristle at distal end of each penultimate joint. Unguis tridactyle. Several speci- 

 mens under board near hydrant, Laguna Beach. 



Key to near relatives of O. alata 



1 . A distinct suture on dorsum between cephalothorax and abdomen. 2 

 No suture on dorsum between cephalothorax and abdomen. 4 



2. Pseudostigmatic organ short, clavate, length (SOO micrm. O. alata 

 Pseudostigmatic organ with long recurved peduncle and fusiform head. 3 



3. Dorsum of abdomen with fine longitudinal wrinkles, length S.'jO micrm. 



0. rugifrons 

 Dorsum of abdomen plain. O. dorsalis 



4. Pseudostigmatic organ setiform. 0. setiformis (Hall) 

 Pseudostigmatic organ with long slender |)ediuiclc and gradually clavate 



head. O. alata var. californica 



Oribata alata var. californica n. var. 

 (Figure 213) 

 Length t71 mierni. Color black, polished. Abdomen globular, with wings, 

 ^Landible chelate. Xo lamella. Dorsal covering extends forward to rostrum 

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

 not apparent. Pseudostigmatic organ straight with a long, thin peduncle and 

 gradually clavate head which bears a few short spines on the distal end. Abdomen 

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

 of body. Wings project forward almost to ti|) of rostrum and are rounded 

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

 and appearance, 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 are transversely sculptured. Legs sparsely 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. Unguis 

 heterodactyle, the middle elaw being the heaviest and ojjposed to the others as 



