Goleopterological Notices, V. 445 



approximate antennae, or (Acolonia) by a peculiar structure of the 

 lateral parts of the head near the eyes. 



Secondly, because we find these differences accompanied in every 

 instance by radical divergencies in the type of male sexual manifes- 

 tation, a feature which in the Pselaphidae possesses an importance 

 which has not always been duly appreciated. In many parts of 

 this family the developmental energy, so to speak, or the energy 

 expended in differentiating species, seems to have been exerted 

 solely upon the males, the females remaining mutually almost 

 similar. This is a familiar fact among the species of lleichenbachia 

 and Batrisus. Types of male sexual modification have therefore 

 great importance, and, when the same type pervades a number of 

 species otherwise allied, we are frequently even compelled to sepa- 

 rate and define genera by such characters alone, as has beeu done 

 by Reitter in the case of Ctenistes and Sognorus and as I have 

 already tried to demonstrate in regard to the allies of Bryaxis (Bull. 

 Cal. Acad. Sci., II, p. 179). 



MORIITS 11. gen. 



This remarkable genus occupies a position with respect to Oropus 

 nearly corresponding with that of Rhinoscepsis to Euplectus. The 

 head is strongly but gradually narrowed before the eyes, forming 

 at apex a wide but strong antennal tubercle, rendered still more 

 prominent by lateral constrictions immediately behind it, the very 

 pronounced antennal prominences separated by a coarse, deeply ex- 

 cavated fossa, which behind them becomes shallower and bifurcates, 

 sending a feeble oblique sulcus to each of the vertexal fovese. The 

 antennae are almost exactly as in Oropus though very narrowly 

 separated at base. The under surface is smooth and without trace 

 of caringe or palpal fossae, but has in the middle just behind the 

 mentum, a very abruptly and strongly elevated, broad and parallel 

 elevation which terminates abruptly midway to the neck. Maxil- 

 lary palpi well developed, sparsely pubescent ; first joint small ; 

 second finely pedunculate in basal half, the apical half abruptly and 

 strongly claviform ; third smaller than the clava of the second, sub- 

 globular; fourth nearly as long as the preceding together, stouter, 

 fusiform, twice as long as wide, with a long slender terminal pro- 

 cess. The other oral organs are normal in structure, the mentum 

 small, the labial palpi minute and slender. Frosternum long, ob- 

 liquely, feebly biimpressed, the mesosternum with two anteriorly 



