MESOSTEFCJS. 217 



tate, yellow, the apex of the petiole black; the postpetiole black, its apex fulvous. 

 Gastrocoeli transverse, fulvous. The abdomen is shining, impunctate ; black, a large 

 yellowish (inclining to fulvous) mark on either side of the second segment at the apex ; 

 the apical segments obscure fulvous. The four anterior legs are entirely yellow, except 

 the line over the femora and the apices of the tarsi, which are black, the tibiae and tarsi 

 being, however, fulvous on the upper side ; the hind legs are fulvous, except the coxse 

 behind, which are yellow, and the femora, which are black beneath and at the sides. 

 Ajreolet minute, open in the middle at the apex, which is wider than the base. The 

 lateral margin of the pronotum projects, especially in front, so that the prothorax 

 is nearly transverse. 



6. Mesostenus admonitus. 



Mesostenus admonitus, Cresson, Proc. Acad. Phil. 1873, p. 160 ( £ ) \ 

 Eab. Mexico, Orizaba x [Sumichrast). 



It is quite possible that further observations may show that this is the male of 

 M. vividus, but the mesopleurae appear not to be largely yellow (Cresson says that the 

 space " behind the base of the wings and a spot on each flank of the metathorax are 

 yellow "), the hind coxae are apparently black, marked with yellow, the apical margins 

 of all the segments are yellow, and the posterior face of the metanotum is coarsely 

 reticulated. 



2. Mesothorax with one yellow mark in the centre. (Species 7 to 29.) 

 i. Metathorax with lateral spines. (Species 7 to 24.) 



7. Mesostenus intrudens. (Tab. X. fig. 16.) 



Mesostenus intrudens, F. Smith, Descr. of New Species of Hymen, p. 232 \ 

 Eab. Costa Kica, Irazu and Cache 1 (Bogers). 



Black ; the orbits all round, the face (except at the sides of the clypeus and a some- 

 what triangular mark going up from them), the clypeus, the apex of the labrum, the 

 extreme base of the mandibles, the palpi, a line on the pronotum, the tegulse, a line on 

 the prosternum, the pleural tubercles, an oblique mark in the centre of the mesopleura, 

 a somewhat oval mark on the metapleura, a mark under the hind wings, a mark at the 

 apex of the middle lobe of the mesonotum, the scutellum, the postscutellum, the 

 tubercles of the metanotum, and the apices of the abdominal segments, yellowish-white. 

 Legs yellowish ; the four anterior femora for the greater part, and the hinder femora 

 entirely, black ; hind coxae black in front and largely so behind, the apices of the tarsi 

 black. Vertex aciculated ; mesonotum punctured, irregularly striated, transversely in 

 front, more strongly and longitudinally behind ; metanotum irregularly reticulated and 

 striated ; centre of the meso- and metapleurse impunctate, shining, the rest striated, the 



biol. CENTE.-AMEB., Hymenopt., November 1885. 2 fp 



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