1911] Mann — Some Northwestern Ants and Their Guests 103 



Myrmica scabrinodis Nyl. var. sabuleti Meinert. — A nest 

 on San Juan Island, Puget Sound. 



Leptothorax curvispinosus Mayr subsp. rugatulus Emery. 

 Taken at Helena, Montana. 



Tapinoma sessile Say. — Common throughout Washington. 

 A large number of nests were examined and no myrmecophiles 

 found. But in the vicinity of Ellensburg, Wash. (March 12, 1909) 

 the tiny cricket, Myrmecojphila oregonensis occurred in every nest 

 examined. 



On Orcas Island, Puget Sound, nests of the pale variety of this 

 ant were often exposed in lifting the bark from fallen trees, and in 

 one nest there were three specimens of a Staphylinid, determined 

 by Dr. A. Fenyes as Zyras {Myrmcecia) lugubris Casey. This 

 beetle, when the nest is uncovered, runs about among the ants, 

 with the tip of the abdomen raised. Wasmann has placed the 

 European Myrmcecia fussi, also commensal with Tapinoma, as a 

 synechthran, and it has been observed to eat the ants. I have 

 not examined the other species, but in lugubris, on the dorsum of 

 the penultimate segment of the abdomen, are typical golden 

 trichomes, characteristic of symphiles. So if lugubris does feed 

 on the ants, here is a case of a predaceous insect with adaptations 

 toward makmg itself tolerated by its intended prey, an example 

 even more extreme than Xenodusa, which confines its attacks to 

 the larvse of the ants. 



Iridomyrmex analis Andre. — At Wawawai, Wash. Rare. 



Lasius niger L. var. neoniger Emery.— Abundant in the 

 vicinity of Pullman, where numerous nests were examined. Myrme- 

 cophiles w^ere taken on two occasions only. May 13th a single 

 specimen of HetcBrius tristriatus Horn was found among a thick 

 cluster of ants on the under side of a stone, and two specimens of 

 the blind Adranes taylori Wick, were taken on the same date, 

 from another nest. 



Lasius niger L. var. americanus Emery. — Adranes taylori 

 was taken in numbers with this ant at Troy, Idaho, in May. The 

 nests were first visited in the afternoon and the beetles found in 

 the upper galleries of every nest examined. No other myrme- 

 cophiles were found in these nests, but in July on San Juan and 

 Orcas Islands, Puget Sound, Myrmecophila Jormicarum was 

 abundant. 



