2'SO HALIDAY ON 



to the entire of each group; and as Von Essenbeck has long 

 since shown the affinity which subsists between Chelonus 

 among the Bassi and Microgaster in the present family, I 

 commence the latter with that genus. Here, however, seems 

 to be the most convenient place to introduce a genus anomalous 

 in its palpi, but bearing, on the whole, more i*esemblance to 

 Microgaster than to any others of the family, although the 

 differences are sufficient to prevent my comprehending them 

 under one generic name, and even to leave their affinity open 

 in some degree to doubt. This may be owing, partly, to the 

 want of sufficient materials, the genus being founded on the 

 examination of a single ill-preserved specimen. 



Gen. II. — Mirax. 



Palpi maxillares 4<-articulati, labiates 3-articulati : antennae 

 I4f-articulatde : occiput retusum : oculi glabri : meso- 

 thoracis scutum haud tripartitum : abdomen breve stib- 

 sessila : aculeus subexertus. 



Sp. M. rufilabris. Fem. Niger, pedibus flavo-ferrugineis : 

 alee hyalines: os, clypeus, squamulce et stigma ferruginea : 

 abdominis segmenta 2 anterior a flava. (Long. corp. .08. 

 alar. .2.) 



Caput thoracis latitudine, transversum crassum ; occiput retusum ; 

 vertex late rotundatus ; ocelli in triangulum ; oculi parvi glabri : e 

 antennae corpore parum breviores, graciles, 14-articulatae ; scapo 

 ovato-cylindrico, pedicello extricato ovato, articulo tertio longiore 

 quam scapo, reliquis longitudine decrescentibus : labrum trans- 

 versum lateribus rotundatum, epipharynga obtegens, hujus tantum 

 ligula apicali attenuata prostante ; mandibular trigonse apice 

 curvata? et tenue bidentes ; maxillae lobus latus obtusus ; labium 

 integrum obtusum ; palpi maxillares 4-articulati, articulis l mo . 

 breviore, 2 do . paulo crassiore ; labiales 3-articulati : thorax ovatus 

 depressus ; prothorax inconspicuus ; mesothoracis scutum rotun- 

 datum, planiusculum, sulculis ordinariis omnino nullis ; metathorax 

 rotundatus : alas anticae — stigma crassum rotundato-trigonum ; 



* This character has had some weight in inducing me to separate the genus 

 from Microgttsler ; it should be remembered, however, that/tke eyes are hairy in 

 one section of the genus Chelonus (Ch. sulcalus, &c), while they are naked in 

 the rest. 



