LEE BARKER WALTON 71 



the genus however, had not at that time proceeded suf- 

 ficiently so that the description is of value in differentiat- 

 ing this species from the several other species of Symbiotes 

 occurring in North America. 



The genus was founded by Redtenbacher in 1849 for 

 the reception of S. latus the generic name being based on 

 the supposition that the species was myrmekophilous. 

 While at times S. latus as well as other European forms 

 appear to have been found in association with ants, it is 

 evidently not characteristic in general of the species and 

 the actual habitat is rather one of association with the 

 lower forms of fungi on the spores of which the individ- 

 uals feed, as noted in another part of the present paper. 



Only six species of Symbiotes have thus far been 

 described, three from the European region, two from 

 Japan, and one from South America. 



The two representatives of the species which have been 

 found were taken under a slightly decayed hardwood log 

 near the south side of the "Hotel Hill" road bridge at 

 Gambier, the log being partially covered with one of the 

 lower forms of fungi, in the spores of which the Sym- 

 biotes feed. In accordance with other representatives of 

 the genus, the species is exceedingly small, being less than 

 2 mm. in length. The drawings below indicate certain 

 anatomical details. The description follows: 



Symbiotes duryi n. sp. 



Characters. — Form more or less broadly oval, mod- 

 erately convex, scarcely pubescent, color dull testaceous; 

 head scarcely punctuate, antennae with club moderate in 

 size, 1. segment large, 2. segment narrow but of approxi- 

 mately the length of the 1. segment and equal to the 3. 

 and 4. together, 3.-8. subequal in length but slightly in- 

 creasing in diameter, 9. larger, triangular, 10. transverse, 

 about three-fourths as long as the 9., 11. asymmetrically 

 pointed. Prothorax twice as wide as long, strongly round- 

 ed anteriorly, broadest at middle, margins toothed, median 

 region convex, base with a strong transverse sulcus from 

 the lateral portions of which extend on each side triangu- 

 lar longitudinal sulci reaching anteriorly about half the 

 length of the prothorax. 



