ii 4 M - W. R. de V. GRAHAM 



be valid after a study of further material. The presence of a fuscous cloud on the 

 fore -wing is not diagnostic for this species-group, as it is absent in some specimens ; 

 such a cloud does not, however, occur in the other species-groups oiPlatygerrhus. 



Trigonoderus algonquinia Girault (1917, Ent. News 28 : 396-397) belongs to the 

 maculatus-gvonp of Platygerrhus according to Hedqvist (1968, Ent. Tidskr. 89 : 36). 

 I have not seen its type, which must be re-examined to see how it differs from the 

 three species here placed in the group. 



Platygerrhus maculatus Erdos 



Platygerrhus maculatus Erdos, 1957 : 362-363, <j>- 



Type material. Holotype $, Hungary, Budapest, Huvosvolgy, 22. ix. 1929 {Biro) 

 and paratype, same locality, 23. ix. 1928 {Biro) in Hungarian National Museum, 

 Budapest. 



Dr. L. Moczar and Dr. Erdos at my request kindly looked for the holotype of 

 maculatus but reported that they were unable to find it ; however, they sent the 

 paratype to me for examination. Some discrepancies between the characters shown 

 by the paratype and those mentioned in the original description suggest the possibility 

 that it and the holotype may not have been conspecific. However, unless the latter 

 is found, this cannot be ascertained. Therefore I assume that the two original 

 specimens were in fact the same and base my interpretation on the paratype. 



The $, as thus interpreted, has the following characters : 



Whole face, including the clypeus, purplish bronze. Clypeus very shiny, alutaceous dorsally 

 but smooth over about its anterior half ; anterior tentorial pits notably large, separated by 

 hardly their own diameter ; genae smooth behind the malar sulcus, sometimes also in front of 

 it ; malar space about two fifths the length of an eye. Antennal scape fully equal to or very 

 slightly greater than the transverse diameter of an eye, reaching the level of the vertex ; 

 pedicellus in profile about twice as long as broad, about as long as the first funicular segment ; 

 funicle slightly clavate, proximally hardly stouter than the pedicellus, its first segment nearly 

 twice as long as broad, sixth segment about 1 -3 times as long as broad ; clava slightly broader 

 than the funicle, slightly longer than the two preceding funicular segments together ; sensilla 

 relatively sparse, in one row on each segment, slightly irregular on the proximal segments of the 

 funicle. 



Thorax similar to that of subglaber sp. n. Metapleuron with about six hairs. Fore wing with 

 lower surface of costal cell with a row of hairs which is broken in the middle, and with scattered 

 hairs in the distal third, its upper surface bare except for a row of hairs in the distal third ; 

 basal vein with three to six hairs ; basal cell virtually bare, both it and the speculum open 

 below ; an oval fuscous cloud below the stigmal vein in the specimens examined. 



Gaster lanceolate, 3 to 3-5 times as long as broad, 1-25 to 1-4 times as long as head plus 

 thorax ; otherwise much as in subglaber sp.n. 



o*. A o* determined as maculatus by Dr. Erdos and which probably belongs to the above female, 

 resembles the latter but differs as follows : 



Antennae similar to those of subglaber sp. n., but with the flagellum rather stouter, proximally 

 as stout as or slightly stouter than the pedicellus, its first segment hardly twice as long as broad, 

 sixth segment only slightly longer than broad. Dorsellum smoother. Row of hairs on lower 

 surface of costal cell only very narrowly broken in the middle, the speculum partly closed 

 below ; the wing immaculate. 



