1 12 M AXDIBULATA.-^HYMENOPTEllA. 



AlcB anticcB areola 1 marginali : . . . . .33. Oryssu's. 



areolis 2-bus marsinales : .... 34. SinEX. 



Genus XXXIII.— OR YSSUS, LatreiUe. 



Antennw fiVi^ovva, 11-jointed in the males, basal joint large, 2nd joint short, 

 obconic; 3rd also obconic, longer; 4th and remainder nearly equal in 

 length, the terminal one acute; 10-jointed in the female, the basal joint 

 robust, subglobose, 2nd short, 3rd elongate, subclavate, 4th and 5th short, 

 6th longer than either of the others, 2 follownng each about as long as the 

 3rd, 9th rather longer and broader, obliquely truncate, 10th small, slender. 

 palpi very unequal, maxillary 5-jointed, labial 3-jointed : mandibles rounded, 

 not dentate : head large, orbicular : ocelli 3 : thoi^ax rather narrower than 

 the head: winffs short; anterior with 1 marginal and 2 submarginal 

 areolets, the last imperfect : abdomen broad, slightly clavate, with the ovi' 

 positor concealed in a groove beneath : legs rather short : tibiw furnished 

 with a pair of spurs at the apex, anterior in the female with a deep suture : 

 tarsi S-jointed, anterior in the female 3-jointed. 



The singular antennae of these insects, united to the paucity of the 

 number of articulations, the single marginal areolet in the anterior 

 wings, the great length of the maxillary palpi, which are distinctly 

 5-jointed, the simple rounded mandibles, Src. sufficiently indicate the 

 difference of this fine genus from the following. 



fSp. 1. coronatus. Niger, abdomine rufo-ferrugineo basi nigra, alis ante apicem 

 late fuscis puncto cosiali hyalino. (Long. corp. 5^ — 6 lin. ; Exp. Alar. 8 — 

 10 lin.) 

 Or. coronatus. LatreiUe. — Steph. Catal. 342. No. 3996. — Curtis, v. x.pl. 460. 

 Head black, slightly shining, with a white line on each side from the eyes to 

 the insertion of the antennae ; eyes fuscous ; thorax black, rough, immacu- 

 late ; abdomen with the 2 basal segments the same, the remainder smooth 

 and rusty-red, the extreme tip blackish beneath; femora black, with a spot 

 at the apex, and the base of the tibiae white, the apex of the latter and the 

 whole of the anterior black, the intermediate and posterior ferruginous 

 within; tarsi lutescent; wings hyaline, the anterior with an undefined 

 fuscous fascia towards the apex, in which on the costa, adjoining the 

 stigma, which is pitchy-black, is a clear spot; nervures pitchy ; antennae 

 with the base and apex black, the intermediate joints white above. 

 Two examples only of this fine insect have hitherto, so far as I am 

 aware, been taken in Britain ; the first was caught in July, 1817, at 

 Darenth wood, by Dr. Leach, while in company with me, on a col- 

 lecting excursion ; the other was also taken subsequently in Devon- 

 shire, by the same distinguished naturalist. 



