TRICHOPTEKYGID^. 99 



transversely depressed at base and widely emarginate ; last segment 

 with two more or less obsolete foveas ; intermediate tibia^ with a small 

 tooth on the inner side near apex. 



Female with the ventral segments of the hind body simple. L. 1^ mm. 



Habitat, Bradfield, Berks. : found by Dr. Joy in some numbers in 

 a starling's nest in February I'JOG. 



This insect is chiefly distinguished by its male characters, us will 

 be gathei-ed from Dr. Joy's description ; in this point it has a resem- 

 blance to E. karsieni, Reich, but it is considerably larger and much 

 more strongly punctured than the last-named species, and has the 

 fovese, etc., much more strongly developed ; from E. pimctahis it may 

 be known (apart from the male characters) by its relatively broader 

 head and stronger punctuation. 



TRICHOPTERYGID^. 



The species belonging to the genera of this family, and more es- 

 pecially those of the large genus Trichopteryx, have been known for 

 some time to be in considerable confusion ; it was hardly to be expected 

 that all the species of the Rev. A. Matthews (founded in several 

 instances on single specimens) would stand, but it is doubtful whether 

 the present workers at the group are not going somewhat too far the 

 other way ; in the catalogue of Heyden, Reitter and Weise (1906) only 

 fifteen species are assigned to Tricliopteryx (not counting five species 

 placed under the line at the end of the list as doubtful), and of these 

 two do not occur in Britain. In our 1903 catalogue Dr. Sharp and I 

 recorded no less than thirty-nine species as British. 



Mr. H. Britten, assisted by Mr. E. A. Newbery, has been doing 

 very good work on the genus FteQiidium, and a joint paper by these tAvo 

 workers entitled " A Revision of the British Species of Ptenidium " 

 has recently been published in the Entomologist's Monthly Magazine 

 (Ent. Mo. Mag. xlvi. (2 Ser. xxi.) 1910, p. 178). We reprint the table 

 which is based to a great extent on Flach's " Bestimmungs Tabellen " 

 (Verb, zool.-bot. Ges. AYien. xxxix. 1889). 



PTENIDIUM, Erichson* 

 I. Scutellary furrow with a minute but 

 distinct middle keel, 

 i. Prosternal keel broad and furrowed 



for nearly its entire length . . . Sub-genus matthewsium, 



Flach, 

 1. Thorax broadest at the base, the two 

 middle basal fovese wanting. Body 

 regularly oval ; upper side castaneous- 

 brown, front parts often darker ; pubes- 

 cence scanty, extremely short, and 

 scarcely visible; elytra sometimes paler 



