186 GEO. H. HORN, M. D. 



position. The affinity so often mentioned in the direction of the Gyrinidae 

 seems rather feeble, and is expressed rather in an outward resemblance 

 of form than in the more important anatomical details. - 



There seems to be an undiscovered form or possibly a lost type 

 to which certain tribes of the Carabinae and Harpaliuae as well as 

 Amphizoidae appear to point, and it is with this hypothetical centre 

 that the Pseudomorphinae seem to be allied. The tribes referred to 

 are Enceladini, Siagonini and Ozaenini. In the discussion 

 of the Gyrinidae there will be found important reasons why we cannot 

 suspect any relation between it and the presant sub-family. 



One tribe alone forms the sub-family. 



Tribe XLVIII. Pseudomorphini. 

 AuteniiPe usually slender, filiform, ooinpressed and subserrate in Ade/otopu.i 

 arising under a moderately dilated frontal plate, the three basal joints glabrous, 

 received in repose in grooves of greater or less length, within the eyes beneath 

 the head. Head short, obtuse, deeply inserted in the thorax, sides of front more 

 or less dilated and infringing on the eyes in front, clypeal suture rarely visible, 

 front without supra-orbital setse. Eyes oval, not prominent, usually confined 

 almost entirely to the upper side of head and widely distant from the buccal 

 fissure beneath. Labrum sRort, transverse, rounded in front and feebly sexsetose. 

 Mandibles short, broad, arcuate externally, sometimes slightly toothed within. 

 Maxillae slender, ciliate and spinous within, not strongly hooked at tip, the outer 

 lobe slender, biarticulate with the terminal joint longer, the palpi short and thick, 

 the terminal joint cylindrical, compressed, obliquely truncate at tip. Mentum 

 large without basal suture, deeply emarginate toothed or not, the epilobes narrow, 

 ligula and paraglossse variable in form, the palpi longer than the maxillary, the 

 terminal joint cylindrical and obliquely truncate or securiform. Thorax as broad 

 at base as the elytra and overlapping them, the lateral margin more or less ex- 

 planate and often fimbriate but without the usual setue. Elytra oblong, truncate 

 at tip, not margined at base, lateral margin acute, sides narrowly inflexed but 

 more widely near the base, the epipleurfe proj)er very narrow, no internal plica, 

 surface at most obsoletely striate without dorsal punctures. Scutellum distinct. 

 Prosternum narrow usually somewhat prolonged behind the coxae, the coxal 

 cavities very narrowly closed behind. Mesosternum very narrow between the 

 coxse. the epimera distinct, not reaching the cijxal cavity. Metasternal epimera 

 distinct, posterior coxse contiguous. Legs short not visible beyond the elytra, the 

 femora stout, rather deeply channeled beneath and receiving the tibiai, the latter 

 slender and with moderate terminal spurs, the anterior tibiae emarginate within, 

 the inner spur remote from the apex. Tarsi slender very feel)ly fiexile, the (daws 

 slender, feebly arcuate and simple. 



This tribe is represented in -our fauna bv the j^rnus Haeudoviorplta 

 with three species. 



In the two specimens of F. Cronkhitei before me the fourth and fifth 

 ventral seoments have at middle a short, transverse, pilose band, while 

 P. Behrensii my unique presents no such character. This may be 

 sexual. I have observed no other sexual diflPerences. 



