A STUDY OF THE GENUS MONOXIA BLAKE 171 



a, little shorier. Unlike most species of Monoxia, apicalis is uni- 

 formly darkly marked in all the specimens examined, the apex of the 

 elytra being always pale. The elytra! pattern resembles that of 

 heavily marked specimens of sordida. The aedeagiis has a slenderer 

 and more finely pointed tip than that of sordida. 



MONOXIA BRISLEYI. new species 



Plate 18, Figure 4. 



Small (about 3 mm.), similar in shape to M. sordida, with a short, 

 broad pro thorax and with the claws toothed in both sexes, but differing 

 from sordida in being more lightly pubescent; all the specimens ex- 

 amined much paler than apicalis; the aedeagus longer and slenderer 

 than in either sordida or apicalis. Head with a small callosity on 

 either side of vertex near the eye, the median line impressed; pubes- 

 cense dense and covering punctation on occiput; color pale, deepening 

 on occiput, labrum sometimes darker brown. Antennae pale with 

 outer joints a little darker. Prothorax approximately twice as wide 

 as long, with slightly angulate sides and small basal tooth; disk de- 

 pressed on sides and in middle; densely and shallowly punctate, the 

 punctation not entirely concealed by the fine pubescence; color pale, 

 sometimes with a darker median area. Elytra with well-marked 

 humeri and long incurving intrahumeral depression; finely and 

 densely punctate and finely pubescent; color either entirely pale or 

 with small brown spots, more or less serially arranged. Body beneath 

 either entirely pale or with the metasternum and first abdominal seg- 

 ments darker, finely pubescent; legs pale with a dark ring about the 

 middle of the femora and tibiae. Claws in both sexes toothed. 

 Length 2.8 to 3.4 mm.; width 1,3 to 1.5 mm. 



Type and 6 paratypes, U. S. N. M. No. 44030, collected by H. F. 

 Wickham, August 10; 3 paratypes in the Museum of Comparative 

 Zoology, Bowditch collection, Cambridge. 



Type locality. — Lancaster, Calif. 



Distribution. — Arizona, Utah, California (Inyo Mountains, Lan- 

 caster, Palmdale). 



Food plant. — Reared from Chenopodium album (H. R. Brisley). 



Remarks. — This tiny species, closely related to sordida and apicalis, 

 differs from both by having a longer and slenderer aedeagus. It is 

 not so densely pubescent as sordida and is paler than apicalis, often 

 being without any dark elytral markings. The punctation of the 

 elytra is finer and less conspicuous than in apicalis, and the elytra are 

 not at all shining as they are in apicalis. The abdomen of the male 

 is not so deflexed as in the majority of the species. M. brisleyi is 

 named after H. R. Brisley, who reared it from Chenopodium album 

 and set it aside as a new species. A. T. McClay has collected it in 

 numbers in the Mojave Desert on a wild desert plant. 



n. S. 60VERNMENT PRINTINS OFFICE: l>3t 



