DIAPERINI NORTH OF MEXICO — TRIPLEHORN 387 



thickened, especially in males where they are also slightly curved; 

 all tibiae slender in both sexes except anterior pair in male, where 

 they are slender and cylindrical on basal half, strongly curved and 

 distinctly flattened and expanded apically, inner margin finely den- 

 ticulate, inner apical angle drawn out to a prominent point. Male 

 aedeagus (pi. 6, fig. 59) relatively small, fusiform. Measurements: 

 length 4.3-4.6 mm.; width 1.9-2.3 mm. (Holotype 4.4, 2.2 mm.; 

 allotype 4.5, 2.2 mm.) 



Remarks. — This is by far the most distinctive member of the genus 

 Neomida in the Nearctic Region. Most of the characters which are 

 exhibited by it have their counterpart in other species as, for example, 

 the entire epipleura, frons armed in both sexes, pubescent dorsal 

 surface and modifications of the front legs in one or both sexes, but 

 in no other species encountered in this study are so many divergencies 

 from the conventional generic pattern to be found. 



Types. — Holotype male and allotype female, USNM 66047: Santa 

 Rosa, Low[er] Cal[iforniaJ. Para types: 1 male and 1 female, L[owerJ 

 Calif[orniaJ, August 1901 (CAT); 1 male and 1 female, same data 

 (CU); 1 male, Santa Rosa, Low[er] Cal[ifornia], September (CAS); 

 1 female, Santa Rosa, Low[er] Cal[iforniaJ (CAS); 1 female, Ma- 

 zatlan, Mexico, Mar. 28, 1918 (CAS); 1 male, 1 female, Santa Rosa, 

 L[owerJ Calif[ornia] (MCZ, H. C. Fall collection). 



Specimens examined. — Eleven. 



Genus Palembus Casey 



Palemhus Casey, 1891, p. 65. 



Type species. — Palemhus ocularis Casey (monobasic). 



Elongate parallel, moderately convex, feebly shining. Head rather 

 short and broad, unarmed in either sex; eyes very large and coarsely 

 faceted, separated both dorsally and ventrally by less than the longer 

 axis of one eye, anterior margin broadly and deeply emarginate; 

 terminal segment of maxillary palpus elongate oval, slender, its apex 

 obliquely truncate; antennae with segments 5 to 11 strongly trans- 

 verse, forming a loose, parallel club. Pronotum transverse, about 

 1.7 times as broad as long, basal and apical margins equal, sides 

 feebly arcuate. Elytra very long, nearly 3.5 times as long as the pro- 

 notum, lateral margins parallel. Prosternal process narrow between 

 coxae, its apex deflected, blunt, not produced; mesosternum flat- 

 tened, narrowly V-shaped; epipleura entire; femora flattened, dis- 

 tinctly claviform; hindtarsi long, basal segment equal to following 

 two combined, only slightly shorter than terminal segment. 



This genus is very closely allied to Neomida, differing from it pri- 

 marily in the unarmed condition of the head in either sex, the more 



