Occaslotial Papers of ihc Mitscnui of Zooloijy 19 



the pronotum and scutelluni combined, while in B. phUyoicmis 

 and B. rlcgaus, as represented in my collection, the commisiu^e 

 is from one-third to one-half longer than the combined length 

 of the pronotimi and the scutellnm. 



Genus Plea Leacii 



19. Pica striola Fieber. Rather uncommon during July 

 among the emergent and submerged vegetation of Sedge Pool. 



Family Xepidae, the Water Scorpions 



This family is represented here by a single genus and two 

 species. 



Genus Ranatra Fabricius 



Juga parallel, their apices somewhat prominent; tylns distinct' 



ly longer than juga R. aiiicncana 



Juga converging anteriorly, almost touching the tylus in front; 



tylus slightly longer tlian juga R. protciisa 



20. Raiiata aiiicricaiia Montandon. Common in all the 

 beach pools, and found occasionally also at Stations I\', IX, 

 and XII, during the later part of July and all of August. In 

 the beach pools the species occurred in the emergent vegeta- 

 tion, and in the larger and more open bodies of water it was 

 found under the thickly vegetated overhanging banks. 

 Xymphs of water scorpions were found abundantly after July 

 10, and eggs were found imbedded in decaying bulrush stems 

 at Station VI on July 26 and August 19. 



The Dottglas Lake specimens vary considerably in size and 

 in the prominence of the subapical notch of the front femora, 

 wdiicli in the majority of the individuals is quite distinct, in 

 others obsolete, and in a few wanting entirely. 



21. Ranata protciisa ]\Iontandon. ]\Ir. Torre-P.ueno has 

 identified two of the specimens sent to him as this species. 



