THE CANADIAN ENTOMOLOGIST 17.'. 



various editorials and business proceedings. In view of this it is necessary for 

 entomologists to support their journals in a more substantial manner, and one 

 way of doing this is to subscribe for as man\' as one can afford. This is a duty 

 which entomologists owe to their science. Moreover, the charges for such 

 subscriptions are extremely low considering present-day prices, and each journal, 

 is well worth its price and luore. 



In one of the publications mentioned in the tables, which is also the official 

 organ of an association of entomologists, the statement is made that "there 

 were a considerable number of both active and associate members who did not 

 subscribe for (he publication." It is inconceivable that an active member of 

 an association would refuse to support its journal. In sonic cases there might 

 be extenuating i-iriumstances, but it is believed that most entomologists can 

 atftird the small sums asked for their publications. The fact that a journal is 

 not de\()tc(l exclusiveU' to the entomological subjec-t in which one is interested 

 is not a \alid excuse lor Jailing to suj)port it. Fhe s\stematist , the economic 

 worker, the insect ecologisl, the insect biologist and the collector all need each 

 other, and each should contribute to the other's support in order \o advance 

 the science of entomolog\'. 



A NEW SPECIES OK PSEllDArHORlfTES (COLLEMBOLA). 



I!N (ilAKT.ES Al.\CNAMAl<A, 

 AiaiMior, Ontario. 



The crystalline liniestone that crops out in many places along the shores of 

 Lac des Chats on the Ottawa River is often curiously eroded between the seasonal 

 high and low water-marks into little circular cups with fairly vertical sides and 

 rounded Ijottoms, ranging in size from al)out three to about eight inches in 

 diameter by three or four inches deep. The cups occur only on horizontal 

 surfaces, and are usually scattered in small groups rather widely separated; but 

 occasicnalh' a flat rock is so closely pitted with the depressions that it looks 

 something liki' an enormous dilapidated honeycomb. The cups nearly always 

 contain water, either from rain or from the splashing of the waves; and no doubt 

 they are caused by the solvent action of water on the limestone, but why they 

 should be so symmetrical in shape is not clear. 



What concerns us here, however, is that these water-filled rock cups are 

 great traps for some kinds of CoUembola. Of course, the brisk, .semi-aquatic 

 Isotoma paliisfris Mull, which is at home on fresh-water shores all over the 

 northern hemisphere, can leap nimbly in and out of the cups and play safeK' 

 o\er the surface of the water. But any of the plodding Collembolan earth- 

 walkers that blunder into the little hollows find them snares for their feet, and 

 once caught on the water film, few of them ever seem to reach the rocky side 

 and safety again. 



So far I ha\e collected nine different species and one variety of CoUembola 

 in the rock cui)s. Four are s|3ecies common el.sewhere in the district, but six 

 of them — and this is what makes the cups such an interesting hunting ground — I 

 have never found anywhere else, and of these at least two are new to science. 

 One of the latter — a Pseudachorutes — ^is described in the present paper. 



.\ugust, 1920. X 



