March. 19^1] Cn AMItERI.IN : LlN Y1"I1 I II»AE OK Al,A>K.\. 41 



Genotype. — Hilaira uta Cliamhcrlin. 



Differs from Hilaria sens. str.. in the possession of five minute 

 teeth along lower margin of furrow of chelicera instead of three, the 

 presence of a single spine only above on tihia IV instead of two, the 

 presence of an anterior process on chelicera of male, the much les^ 

 developed dorsal distal lobe of the tibia of male palpus and particu- 

 larly the structure of the bulb of the palpus. In the arrangement of 

 eyes very similar to Hilarotcs (Hull. 1909). though the lateral eyes 

 of the latter are not on tubercles and the middle region of the head in 

 front of elevated region is not depressed. Hilaroti's, as typified by 

 rcproba (Cambridge), a species included by Simon in Hilaira sens, 

 lat. (Hist. Nat. Araign., I.), is otherwise distinguished in having 

 but three, moderately large, teetli along lower margin of furrow of 

 chelicera, the presence of two dorsal spines on tibia IV. etc. 



In addition to the genotype, one other species is known to me at 

 present as belonging to Montilaira, this being Rrigonc pcrplcxa Key- 

 serling. of which the Tvicticns pcctinatus of Rmerton seeins to be a 

 synonym. The two species are very close in general structure but 

 differ in various details. Thus the males are readily distinguishable 

 by the difference in the anterior dorsal lobe of the tibia of the male 

 palpus, this presenting a conspicuous median tooth in pcrplcxa with 

 an angulation each side, whereas the margin is evenly rounded in uta, 

 as shown in figs. 12 and 11. The median enibaymcnt in the anterior 

 free edge of the epi.gynal plate is dce])er and at bottom l)roader in 

 pcrplcxa than in uta. The paired claws (leg I) in "''/ have each 

 typically eight teeth, in pcrplcxa but six, etc. 



Microneta heathi n<.\v species. Plate IV', fis- 13- 



Carapace dusky over fuivoiis. blackish along borders. Legs fulvous. .Ab- 

 domen blackish. Posterior row of eyes procurved ; median eyes larger than 

 the laterals (about 3.7:3), a little more than three-fourths their diameter 

 apart (3 : 3.7), a little nearer to the laterals. Anterior row of eyes a little pro- 

 curved, the summits of the eyes forming a nearly straight line; median eyes 

 much smaller than the laterals, the diameters being about as 2.5:4; less ih.in 

 their diameter apart, their diameter from the laterals. Area of median eyes 

 trapeziform, wider behind than in front in the ratio 9: 6.5, equal in length and 

 width, or the length sli^'htly greater. Clypcus lower than the width of the 

 median eye area in front. Unpaired claw (first leg) with a single tooth be- 

 neath ; paired claw with twelve short teeth which increase in length in going 

 distad, the longest of these not quite equalling the diameter of the contiguous 



