psilopus. 27 1 



12. P. caildat ulus Loew. % . — Parvus, nitidissimus, viridis \A 

 ex viridi ckalybeus, facie pilosa, alis immaculatis, anteriore venae longi- 

 tudinalis quartae ramulo arcuatim ducto, halteribus flavis. 



%. Abdomine fasciis nigris angustis ornato et in apice pilis solito multo 

 longioribus vestito, femoribus nigris, viridimicantibus, summo femorum 

 anterioruni apice tibiisque omnibus flavis, apice tibiarum posticarum 

 tarsisque omnibus ex fusco nigris, tarsorum anteriorum basi tamen 

 fiava, calcare tibiarum intermediarum longissimo, primo tarsorum inter- 

 mediorum articulo setulis incurvis scabro. 



9 



Small, very shining, green or bluish-green ; face hairy ; wings without 

 picture ; the anterior branch of the fourth longitudinal vein arched ; 

 halteres yellow. 



% . Abdomen with narrow black bands, at the tip with much longer hairs 

 than usual, femora black, with a greenish reflection, the extreme tip of the 

 four anterior femora, and all tibiae yellow ; the tip of the hind tibiae, and 

 all tarsi brownish-black ; still the first joint of the fore tarsi yellow, the 

 spur of the middle tibiae very long; first joint of the middle tarsi 

 beset with crooked bristles, rasp-like. 



9. Long. corp. 0.15. Long. al. 0.15. 



£>yn. Psilopus caudatulus Loew, Neue Beitr. VIII, 93, 12. 



It resembles the P. scobinator so much, that the statement of 

 the slight differences will be perfectly sufficient for its recognition ; 

 the hairs at the tip of the abdomen are much longer, more bristle- 

 like, and when well preserved, are of the same length as the four 

 last segments of the abdomen, whilst in P. scobinator, the two 

 which are longest among them are but little longer than the last 

 segment. 



Hab. Missouri. (Schaum.) Illinois. (Le Baron.) 

 Observation. — The name which I have given to this species is 

 intended to remind of P. caudatus Wied., which undoubtedly 

 belongs to the same group ; but, by its larger size, it seems to 

 be different from the species known to me. In the Neue Beitr age, 

 in consequence of a mistake, some incorrect statements have 

 been made by me about P. caudatulus. Its resemblance with 

 P. scobinator is so great that one would be very much inclined to 

 take it for a mere variety of it, if the difference in the length of 

 the hairs at the tip of the abdomen was not so considerable, and 

 if the distinction of the other species of this group, otherwise 

 agreeing perfectly in all characters, did not likewise rest on some 

 single plastic character. 



