268 G. E. J. NIXON 



Philippines : Los Banos, 4 $$, 1 $$, (one $, the TYPE) ; Mindanao, Dapitan, 

 1 <$ ; Kolambugan, 1 $. (All Baker) ; Panganasinan, Sta. Barbara, 3.11.1953, 1 <$, 

 (H. & M. Townes) . 



Type in the U.S. National Museum. 



This genus differs from Microplitis on shape of scutellum, length of inner spur of 

 hind tibia and presence of occipital margin. 



ALLOPLITIS gen. n. 



Type-species : Alloplitis guapo sp.n. 



I have erected this genus for two species that are not at all closely related but 

 differ from all species of Microplitis known to me on the structure of tergite (2 + 3). 

 The shape of this tergite has been described in the key and is shown in figure 241. 

 This character, in combination with a curious propodeal structure which (though 

 different in the two species) is not found in Microplitis, provides enough justification, 

 I think, for the use of a new generic name. 



The ocelli are in a low triangle, the posterior, transverse tangent to the anterior ocellus cutting 

 the posterior pair. The hind tibia is markedly swollen and its outer surface shows hardly a trace 

 of differentiated spines ; this last is a typical feature of Microplitis and a swollen hind tibia is 

 found in many exotic species of the genus ; inner spur of the hind tibia not reaching beyond the 

 middle of the hind basitarsus. The areolet of the fore wing is weakly four-sided. 



Altogether Alloplitis has much more in common with Microplitis, Philoplitis and 

 Snellenius than with any of the species-groups that I have assigned to Protomicroplitis. 



Key to Species 



A Tergite 3 rugose and about half as long as 2 (Text-fig. 241) ; frons shiny and with 

 deep, subconfluent punctation ; metacarp about two and a half times longer than 

 its distance from the apex of the radial cell ; (Text-fig. 240) tergite 1 strongly 

 rugose, slightly widened apically, black but yellow within a deep, basal excavation ; 

 propodeum with a medial keel that forks posteriorly to form a short, elongate 

 fovea ; no trace of laterally directed costulae ; inner spur of the hind tibia hardly 

 one third as long as the hind basitarsus ; hind tarsus as long as its tibia ; flagellum 

 fairly slender, the preapical segment fully twice as long as wide. 



Antenna, all the coxae and femora, except the hind femur at apex, yellowish ; 

 length: 3 mm. .......... guapo sp. n. 



Philippines: Luzon, Mt. Makiling, 3 <j>$, one the TYPE, (Baker). Type in the 

 U.S. National Museum. 



This species is essentially characterized by the long metacarp and the rugosity of 

 tergite 3, that is, the apical part of tergite (2 + 3). 

 B Tergite 3 smooth, shining and only slightly shorter than 2 : frons shiny as in guapo 

 but fairly evenly striate right across ; metacarp shorter, hardly twice as long as its 

 distance from the apex of the radial cell ; tergite 1 finely, evenly rugose, with a 

 shallower basal excavation that is dark like the rest of the segment ; propodeum 

 without a medial keel but with an ill defined V-shaped areola that is closed above by 

 a strong keel ; this keel extends laterally as far as the lateral, propodeal keel ; pro- 

 podeal spiracle enclosed within keels; hind tarsus slightly shorter than its tibia ; 

 hind tibia stouter than in guapo, its inner spur about half as long as the hind basi- 

 tarsus ; flagellum almost reddish yellow in apical half, short, somewhat thickened 



