THE CANADIAN ENTOMOLOGIST. 67 



Mississippi Valley. At Mongona (June 22), and Marshalltown (June 24), 

 Iowa, and at Sterling, 111. (June 26), females were taken with recently-laid 

 eggs. 



Genus Pachymerium Koch. 



Pachymeriumfen'ugiiieiun Koch. 



Syn. Geophilus foveatus (McNeill). 



Localities. — DeWitt, Iowa ; Peoria, 111.; Devil's Lake and Fond du 

 Lac, Wise, 



At Fond du Lac (July 6), the species was found in great abundance 

 among the stones at a river's edge, partly grown individuals being com- 

 mon, and a considerable number of females being found with bodies still 

 coiled about their recently-hatched young. 



This is a species widespread in the Eastern United States, as it is in 

 Europe. The specimens secured are similar in size to Austrian specimens, 

 most being under 25 mm. in length. 



Subfamily Chilenophilinse 

 Genus Taiyuna Chamberlin. 

 Taiyuna opita, sp. no v. 



Proportionately robust ; attenuated strongly caudad, and also de- 

 cidedly but less strongly cephalad. Sparsely clothed throughout with long 

 bristles. 



Head with corners rounded ; sides convexly curving ; caudal margin 

 straight ; anterior margin extended forward from corners to middle, and 

 a little incurved at median line; longer than wide in ratio, 19:16, and five 

 times longer than exposed portion of basal plate. Prebasal plate absent- 

 Basal plate overlapped in front by the cephalic, and behind by the first 

 dorsal plate; free portion wider than median length in about ratio 34:7. 

 Antennae short ; articles moderate and short, the ultimate equal in 

 length to the two preceding taken together. 



Claws of prehensorial feet when closed reaching the distal end of the 

 first antennal article. Claw at base with a subcylindric, apically truncate, 

 tooth ; prefemur also with a strongly chitinized tooth at distal end ; the 

 intermediate joints also each with a distinct, conical and well-chitinized 

 tooth. Prosternum unarmed ; its anterior median margin nearly straight, 

 not excised ; chitinous lines not evident ; suture parallel with margin ; 

 wider than long in ratio 39:35, longer than prefemur in ratio 7:4. Dorsum 

 weakly bisulcate, also with a more median pair of fine sulci. Anterior 

 praescu^a short, being of moderate length in the middle region, and then 



