254 SEEEICOENIA. 



ADELOTHYREUS. 



Adelothyreus, de Bonvouloir, Mon. des Eucneniides, p. 609 (1870). 



This genus scarcely differs from Farsus, except in having the first joint of the posterior 

 tarsus as long as the following joints together. 



Two species occur in our fauna. 



1. Adelothyreus flavosignatus. 



Adelothyreus flavosignatus, de Bonv. Mon. p. 614, t. 30. fig. 1 \ 

 Hah. Mexico 1 , Cordova (Salle) ; Guatemala, Mirandilla (Champion). — Colombia 1 . 



A pretty species of slender form, having on each elytron an oval yellow spot of 

 variable size. 



2. Adelothyreus comes. 



Subcylindrical, slightly narrowed posteriorly, piceous-black, subopaque : antennae — ( $ ) ferruginous, not half 

 as long as the body, joints 4-10 strongly serrate, and gradually becoming slightly shorter — ( 3 ) piceous, 

 joints 4-11 gradually longer, 4-10 pectinate, the branches at least twice as long as the joint ; head 

 densely and rather coarsely punctate, a slight frontal tubercle smoother ; thorax slightly longer than 

 wide, sides parallel, arcuate in front, disc flattened, median line distinctly impressed on the posterior 

 declivity, becoming very vague anteriorly, on each side of the middle of the base a moderately deep and 

 broad oblique depression, a shorter but deeper one above the hind angles, surface densely punctate, some- 

 what rugose, subgranulate near the sides, pubescence very short and inconspicuous ; elytra vaguely striate 

 at the base, more distinctly at the apex, intervals closely rugosely punctate, subgranulate at the base ; 

 sides of the metasternum and posterior coxal plates almost cribrately punctate ; abdomen closely coarsely 

 punctate, cinereo-pubescent ; legs ferruginous. 



Length 5 millim. 



Hah. Mexico, Cerro de Plumas (Hoge) ; Panama, Bugaba, Volcan de Chiriqui, San 

 Feliz (Champion). 



This species is evidently very closely related to A. dejeani from temperate North 

 America, of which examples are not at hand for comparison. The specimens have 

 indistinctly brown humeri. 



ADELORHAGUS. 



Form cylindrical. Antennae slender, slightly serrate, longer than half the body; first joint equal to the next 

 two, second small, third longer than half the first, fourth a little shorter than the third, fourth to the 

 tenth gradually increasing in length, eleventh nearly as long as the preceding two. Clypeus feebly arcuate 

 in front, the angles joining the gense by a narrow isthmus, the base narrower than the distance to the 

 eyes. Thorax with the hind angles strongly carinate ; the posterior inferior marginal line sharply defined 

 nearly three-fourths to the apex, the anterior inferior line very short, the upper supplementary line curving 

 nearly to the middle. Propectus without well-defined groove, with merely a smooth space along the 

 suture. Metasternal episterna narrow, parallel. Posterior coxal plates very little broadened internally. 

 Last ventral segment triangularly prolonged. Hind tarsi shorter than the tibiae, the first joint shorter 

 than the following joints together, the fourth very small, excavate-emarginate ; claws simple. 



This new name is suggested for a small species which will not enter any of the genera 

 allied to Microrhagus. While it possesses many of the more important characters of 



