PROCEEDINGS OP THE NATIONAL MUSEUM 



VOL. 71 



granular-punctate; middle of scutellum with shining surf ace showing 

 between the punctures; tegulae black, with two pale ye low spots; 

 wings dilute fuliginous; basal nervure going basad of nervulus; 

 outer recurrent practically meeting outer intercubitus; tarsi densely 

 covered with white hair on outer side, but with red hair on mner; 

 no pulvilii; abdomen dullish. ., , . 



Canamina, Bolivia, July (W. M. Mann). Described from one 

 female Larger than vl.z^emrmnumSchrottky, and also known by the 

 variegated legs and broad band on clypeus. Seen from behind, there 

 is a rather strong superficial resemblance to the European A. diadema 

 Latreille. 



Type.— Csii. No. 29073, U.S.N.M. 



Genus DIANTHIDIUM Cockerell 

 Holmberg in 1903 proposed a subgenus AntJiodiodes , to contain 

 two new species from Argentina. The name had appeared m print 

 many years earlier, but without definition or described species. 

 Schrottky referred A. megacUloides Holmberg (whicli may be re- 

 garded as the type of the subgenus) to DiantUdium, but Holmberg 

 did not place such species as Diantliidium conjusum (Smith) =;ens6n^ 

 Friese) and D, hicoloratum (Smith) in his new genus. The venation 

 of AntJiodiodes resembles that of DiantUdium, but the proportions ot 

 the joints of the labial palpi are rather those of true AMum. In 

 the labial palpi, D. clirysurum agrees rather closely with A megaM- 

 oides, the joints measuring in m about as follows: (D 9^0 (^) 545, 

 (3) 95 (4) 103 D. g^mdrimaculatum, which seems to be ot the same 

 general alliance, dift'ers rather conspicuously in the labial palpi, the 

 joints measuring about as follows in m: (D 370, (2) 320 (3) 95, (4) 

 88 These measurements were made from the protrudmg mouth 

 parts without mounting, but are sufficiently accurate for the present 

 purpose The whole series of Bolivian DiantUdium now before me 

 may apparently be referred to Antliodiodes, which may be i-egarded 

 as a subgenus. These bees, with certain species of PsaenytUa (as P. 

 collaris Schrottky and P. facialis Gerstaecker) and the wasps ot tne 

 genus Nedarinia appear to constitute a case of Mtillenan mimicry. 

 Nedarinia is spread over the Neotropical region and gets as far north 

 as San Benito, Tex., where my wife took N. lecheguana (Latreille) at 

 flowers of Koeherlinia spinosa. 



The following key separates the species belonging to or resembhng 

 AntJiodiodes. In the case of several species not seen by me, it is im- 

 possible to be sure that they are AntJiodiodes, since it is possible or 

 HvvantUdium {H. tahoganum Cockerell) to present a supei-hcially 

 similar appearance. H. heniense, described below, also resembles this 

 series, and the wings fold longit udinally as in a wasp.^ 



^Antkidium n.encanu.n Cresson, of which I have a paratype, is to be called HypantM<lium mencanum 



