4 Psyche [March 
very slightly alutaceous, sparsely punctured. Elytra about one 
and two -thirds times as long as wide; sides explanate to about 
one-third from apex; disk slightly shining; striae closely punc- 
tate to apex, where they are a little confused. 
Length: 2.1-2.3 mmj Width: 0.9-1. Omm. 
Holotype number 15950 in the Museum of Comparative 
Zoology, collected by Professor C. T. Brues in “Hot Spring no. 
24; Temperature 38.8°; Beowawe, Nevada.” Paratypes: 24 
with the same data as the holotype; 1 collected by Professor 
Brues in “Hot spring no. 9; Amedee, California.” Paratypes to 
be deposited in the Museum of Comparative Zoology, the United 
States National Museum, the Canadian National Collection, 
the California Academy of Sciences, the collection of Mr. H. C. 
Fall, and that of the writer. 
In Horn’s table (Trans. American Ent. Soc., 1890, pp. 18- 
19) 0. bruesi would fall in Ochthebius s. str. near interruptus and 
attritus, from both of which it differs in being larger and more 
elongate and in having both the discal and lateral impressions 
strongly marked. The legs are longer and stronger, and the 
entire insect has a distinctive loose-jointed appearance which is 
difficult to describe. I have seen all the older types of the genus 
in the LeConte collection at Cambridge, and have studied all the 
more recent American descriptions, none of which can fit the 
species here described. 
The penultimate joint of the maxillary palpus is rather 
curiously and consistently deformed in certain of the specimens 
at hand. Normally it is rounded on all sides and rather thick, 
but sometimes it is flattened in the vertical plane and concave on 
one side. In this case the ultimate and apparently the pseudo- 
basal joints are also strongly flattened. Of the twenty four spec- 
imens in which the palpi can be clearly seen, thirteen are normal 
on both sides, two have the right palpus only deformed, two have 
the left palpus only deformed, and six have both palpi deformed. 
One specimen has the left palpus normal and the right with the 
penultimate joint represented by a small globular body and the 
ultimate joint absent. How this wholesale malformation has 
been produced I do not know. 
