MTCOTEETUS.— -PAEATEITOMA. 71 



Hab. Guatemala, San Juan in Vera Paz (Champion). 



Perhaps allied to M. savignyi, the small form of which from Chiriqui it somewhat 

 resembles. 



MYCOMYSTES. 



Characteres plerumque sicut in Mycotreto, tibiis autem ad apices angulariter dilatatis, generi Amblyopi similis 

 videtur. Species adhuc unicus, corpore oblongo, parum ovato, toto pallide flavo vel ferrugineo. Palpi 

 maxillares articulo ultimo perlato, valde transverse Mentum pentagonicum, sed angulis omnibus aegre 

 discretis, basi angustato. Prosterni processu apice emarginato, antice haud compresso. 



The single species for which it is necessary to form a new genus on account of the 

 dilated tibiae has the general appearance of a large pale rusty-red Mycotretus, with 

 which indeed the majority of its characters agree. Amblyopus is a genus only 

 inhabiting the eastern tropics, and our insect has no real affinity with it. The 

 angularly widened tibiae of My corny stes are unlike anything else amongst its true allies, 

 though they are reproduced in the South- American genus Mycolybas. 



l. Mycomystes ferrugineus. (Tab. IV. fig. 8.) 



Oblongo-ovatus, pallide ferrugineus, antennarum articulis sex ultimis et mandibularum apicibus nigris ; capite 

 prothoraceque creberrime minute punctatis ; elytris striatis, interstitiis creberrime perobsolete punctatis ; 

 subtus testaceus, metasterni lateribus et episternis subrugose punctulatis, epimeris lsevibus. Long. 7| 

 millim. 



Hab. Mexico, Cerro de Plumas (Hbge). 



About the size and form of Mycotretus sobrinus ; entirely pale rusty-red, with the 

 exception of the apical half of the antennae and the tips of the mandibles. The 

 punctuation is very fine and close, except that of the sides of the breast, where large 

 but irregularly shaped punctures are to be found ; these irregular punctures have a 

 tendency to form longitudinal rows, and are occasionally confluent. The abdomen is 

 finely punctate. The tibiae have their inner side a little sinuate, the outer side 

 widened and forming an angle at the end, which is somewhat obliquely truncate (the 

 insertion of the tarsi being quite on the inner side) ; their upper and under surfaces 

 are flat and slightly pubescent. Both the abdominal and metasternal impressed lines 

 are present. Two specimens. 



PAEATEITOMA. 



Mentum pentagonicum. Palpi maxillares articulo ultimo lunato, valde transverse Corpus subtus rugose 

 punctatum, pubescens. Presternum antice haud compressum vel carinatum. Lineae metasternales et 

 abdominales obscuri vel nulli. Coxae modice distantes. 



I propose this genus to include a number of small species which, on the whole, are 

 very near to the type of Mycotretus, but have some of the characteristics of Tritoma. 

 The elytra, at least of some of the species (e. g. P. divisa), have the short stria near the 

 scutellum, which proves an alliance with the last-named genus. The strongly punctured 



