NEUKOl'TEKA— TlUGHOrTERA— PHKYGANID^. 195 



3.2°"° at their posterior end, the thickness of the walls being about 0.75""". 

 As will be seen by these measurements, the cases are a little larger at their 

 mouth, but otherwise they are cylindrical, taper with perfect regularity, and 

 are straight, not sliglitly curved, as in many phryganid cases. They are 

 completely covered with minute, rounded, water-worn pebbles, apparently 

 of quartz, generally subspherical or ovate, and varying from one-third to 

 two-thirds of a millimeter in mean diameter ; they thus give the cases a 

 granulated appearance. Nearly all the cases are filled with calcareous 

 material, but some are empt}' for a short distance from tlieir mouth, and in 

 one case tlie inner lining of this part of the case has a coating of minuter 

 calcareous particles, evidently deposited therein after the case was vacated. 

 As the present thickness of the walls indicates (as also the size of the attached 

 pebbles), the silken interior lining of the case must have been very stout. 

 This follows also from the appearance of one or two which have been 

 crushed, for they have yielded along longitudinal lines, indicating a parch- 

 ment-like rigidity in the entire shell. In one of the specimens the outer 

 coating of heavier pebbles has in some way been removed by weather- 

 ing, and has left a scabrous surface, apparently produced by minute, hard 

 grains entangled in the fibrous meshes of the web ; it still, however, retains 

 its cylindrical form. 



The size of the case, its form, and the material from which it is con- 

 structed seem to indicate that it belonged to some genus of Limnophilida3 

 near Anabolia. 



Hoi'se Creek, Wyoming. Dr. A. C. Peale. 



Subfamily PHRYaANIO.^ Stephens. 



This subfamily of caddis-flies, comprising the larger species, is found 

 only in the northern portions of the globe, and is numerous neither in species 

 nor in genera ; nevertheless it is the only group of caddis-flies whose remains 

 liave hitherto been found in rocky strata, if we except the larval cases, of 

 which there is likely to be more or less question. And it is not a little 

 strange that they have been found in several distinct places, ranging from 

 Aix in the Oligocene to Parschlug in the upper Miocene. Mombach, the 

 Isle of Wight, and Atanaterdluk, in Greenland, have also furnislied species. 

 From amber also three species are known, and now we have three more 

 species, including a new generic form, to add from the strata of Colorado 



