22 HYMENOPTEEA. 



apex of the fourth abdominal segment, in other species they do not reach much beyond 

 the middle of the third ; and the same remark applies to the length of the metatarsus. 

 I have therefore sunk Waldheimia, which was formed for a species which possessed 

 the three peculiarities I have mentioned above. 



The majority of the Neotropical species are much longer than the Nearctic or 

 Palsearctic species. Some tinge of yellow is the prevalent colour ; and the wings are 

 seldom or never altogether hyaline. 



Monophadnus is the largest of the genera allied to Selandria ; fifteen species have 

 been described from America north of Mexico, five or six from South America. There 

 are forty European ; three are known from Japan and China, and one from India. 



1. Monophadnus scutellatus. 



Monophadnus scutellatus, Kirby, List of Hymen, i. p. 177, t. 7. f. 18 1 . 

 Hab. Mexico, Orizaba 1 . 



2.. Monophadnus trimaCUlatUS. (Tab. II. figg. 6, ? ; a, head, from front ; 

 b, from side; c, antenna; d, claws; e, tarsus). 



Niger, nitidus, antennis (apice exeepto), vertice, maculis 3 inesonoti, abdominis fasciis medio tibiisque posticis 



dimidio apicali nigris, antennarum apice tarsisque albis ; alis flavo-hyalinis, costa et stigmate testaceis. 

 Long. 10 millim. 



Hab. Guatemala, Zapote (Champion). 



The antennae are not much longer than the abdomen, thickened in the middle, 

 pilose; third joint one fourth longer than the fourth, apex of first joint and four 

 apical joints white. Sutures on vertex shallow ; frontal area indistinct in front, distinct 

 behind and in the middle ; the base sharply pointed ; a shallow fovea in front of ocellus ; 

 the apex of fovea raised in middle. Lateral antennal fovese of moderate size, running 

 into the large central one, which is double their size. Clypeus rounded at apex. The 

 transverse median nervure is received a little in front of cellule ; transverse radial in 

 apical third of third cubital, which is double the length of second, and one half wider 

 at apex than at base. There is a distinct appendicular cellule in hind wings; their 

 accessory nervure is shortly appendiculated. Claws bifid. There is a small black spot 

 on each side of sternum, and another on upperside of metapleura. The black mark 

 on centre of vertex is wider at base than at apex, and projects at the ends. 



3. Monophadnus lsetus. 



Rufo-testaceus, antennis, capite (ore exeepto), abdominis apice, tibiis tarsisque nigris ; alis flavescenti-hyalinis, 



apice fusco, nervis testaceis. 

 Long. 11 millim. 



Hab. Panama (JBoucard). 



Broad compared with the length. The antennae are pilose, thickened in the middle, 



