THE CANADIAN ENTOMOLOGIST. 223 



seems quite distinct. Another lot, also from Dracot, April 20, 1895, 

 " with Lashis ciaviger, Rog., and L. fiavus, very common," presents no 

 structural differences, though Mr. King gives the colour when alive as 

 purple. A third lot, " with Lasiiis claviger and Z. flavtis, Lawrence, 

 Mass., April 10, 1894, colour purple," also agrees with R. Kirigii ; hwX. 

 one specimen of this lot has the antennal formula 631 (245), 6 with only- 

 two whorls of hairs, and may represent another species. Another has 

 the formula 63 (21) (54). 



(2.) Ripersia lasii, n. sp. — -^ . Small, elongate-oval, clear white 

 when alive (as I learn from Mr. King); legs ordinary, rather slender; 

 tibia slender at base, almost as long as femur, but only about half as 

 thick ; tarsus about two-thirds length of tibia ; claw rather long, pointed, 

 slender ; tibia and tarsus each with three short bristles on inner side. 

 Trochanteric bristle not very long. Mentum dimerous, three hairs on 

 each side near tip. Digitules apparently absent. Antennae 7-jointed : 7 

 longest, longer than 5 -f 6, but not quite as long as 4-^54-6; 2 next 

 longest; 3, 4 and 6 subequal ; 5 shortest, a very little broader than long. 

 Joints with very sparse whorls of hairs : 7 with three wiiorls, 7 a little 

 constricted about the beginning of its apical third. Another specimen 

 has only 6 -jointed antennse, varying thus like the European R. 

 pulveraria : 3 is almost as long as 6. Formula 6 (31) 254. Four 

 is as broad as long. As in pulveraria., the third joint divides to 

 make the 7 joints. The joints are more constricted at the sutures 

 than in pulveraria as figured by Newstead. 



From R. Kingii it differs by the narrower third joint of antennae, 

 the somewhat less tapering apical joint, the more slender tibia and 

 tarsus, the tarsus less tapering to claw, the claw less curved, femur 

 not so stout, tarsal hairs shorter, stronger, not so curved, mentum shorter 

 in proportion to its length, legs rather brownish than yellowish. 



Hab. — Methuen, Mass., June 17, 1896, with Lasius americafius, 

 Em., not common [G. B. King]. Another lot is marked by Mr. King, 

 "with Lasius Jlavus, L., Methuen, Mass., Oct. 10, 1894, colour clear 

 white, not very common." This is, I think, certainly the second stage of 

 R. lasii, and may be described thus : Very slightly over i mm. long, 

 rather elongate-cylindrical, though not excessively so ; legs quite large ; 

 femur fairly stout, but not so stout as in adult ; tibise somewhat shorter 

 than tarsi. Antennfe 6-jointed : 6 about as long as 3 + 4.4- 5, but not so 

 long as in the adult. Formula 63 (21) (54). This second stage may be 



