Coleopterological Notices. 503 



much shorter and more transverse, and the elytra polished through- 

 out and not dull toward apex as is the case in acutus. 



Asida angitstula, of which I have now seen nine specimens, differs 

 from muricatula in its constantly much narrower and more parallel 

 form and shorter and sparser pubescence ; the legs are, however, 

 similarly clothed with short inclined seta?, and are devoid of long 

 flying hairs. 



Blaiostinus californicus Mots, must be regarded as a manuscript 

 name, the original description being completely inadequate for its 

 recognition ; it was probably taken in or near the western part of 

 Texas. 



V. 



The small white object previously described (Col. Not. I, p. 196), 

 has been further reported upon by Mr. Beaumont, who states that 

 it is found in large numbers in all the nests of the termites, irrespec- 

 tive of species, and that it runs Avith such velocity as to be very 

 difficult to capture, turning and jumping slightly off its feet with 

 great facility, apparently by means of the fleshy abdominal appen- 

 dage, of which it makes constant use. 



These facts, in conjunction with its general organization, prove 

 it to be a member of the order Thysanura, belonging to an unde- 

 scribed genus, and constituting a family quite different from either 

 the Lepismidas, Campodidse or Poduridae. For the genus I would 

 propose the name Gastrotheus, and the species may be called 

 G. termitaritis. 



The mandibles are short and very robust, the outer contour 

 strongly, evenly arcuate, the apex abruptly produced and very 

 finely acuminate. I cannot perceive any distinct internal denticu- 

 lation. 



