Casey — A Revision of the American Paederini. 61 



the male much larger, longer than wide, and distinctly longer than the 

 prothorax, equal in width to the latter and but very slightly narrower 

 than the head, similarly punctured. Length 10.0 mm.; width 1.8 mm. 

 Lower California femoralis Lee. 



Legs shorter and relatively stouter, pale honey-yellow throughout, the 

 femora abruptly black in outer third. Body much smaller than in the 

 preceding species, stout and strongly convex, similar in coloration and 

 polished lustre; head in the male a little wider than the prothorax or 

 elytra, the sides converging and circularly arcuate behind the eyes to 

 the neck, similar in the female but subequal in width to the prothorax 

 and narrower than the elytra; eyes at one-half more than their own 

 length from the base; prothorax scarcely longer than wide, oval, 

 rounded at the sides, the latter strongly converging posteriorly as 

 usual; elytra quadrate and scarcely longer than the prothorax in the 

 male, notably longer in the female. Length G.8 mm.; width 1.25 mm. 

 Europe and Texas riparins Linn. 



Legs nearly as in riparius but entirely clear honey-yellow throughout, 

 without trace of darker ornamentation. Body similar to that of 

 riparius but still smaller and slightly more slender; head with only very 

 slight sexual differences, distinctly wider than the elytra in the male 

 and only just visibly so in the female; eyes moderately convex and 

 prominent, at about a third more than their own length from the base, 

 the sides behind them strongly converging and circularly arcuate in 

 both sexes; prothorax scarcely visibly longer than wide, obtrapezoidal, 

 the sides broadly arcuate, a little more rounded anteriorly; elytra not 

 quite as long as wide or as long as the prothorax in either sex, 

 coarsely, sparsely punctate, the sides feebly diverging from the base 

 and broadly, feebly arcuate; abdomen subequal in width to the elytra. 

 Length 6.0 mm.; width 1.0 mm. Florida (Crescent City) and 

 Georgia littorens Aust. 



It is rather remarkable that the European riparius should 

 occur within the United States, but two males collected in 

 the Caucasus and forwarded to me by Mr. Reitter, agree in all 

 respects — allowing for sex — with a single female in my 

 cabinet taken at an unrecorded locality in Texas. If it was 

 collected in the neighborhood of Galveston, there is a strong 

 probability of its being simply an adventitious importation, 

 and, that it has established itself in America, is by no means 

 proved. The Mexican mexicanus^v.y is listed by Henshaw, 

 but I have seen no examples taken within our borders ; it has 

 the coloration and facies of grandis but is much smaller, 

 with the antennae and legs rufous, the tip of the posterior 

 femora alone black. Our species are all alate and with dis- 

 tinct elytral humeri. 



