UKMIl'i'liKA lUri'KllOi'TEKA. 503 



speckles, triosl of which Ibnn ;i siihcostal streak. Leugih of the body 

 8.^—91 lines. 



The roiuidefl and more porreet horns of the thorax distiiif^uisb this 

 species from ]\T. denlalinn and from M. t/uadratuiit. 



a — c. New Guinea. Presented by W. W. Saunders, Esq. 



Genus 2. THALMA. 



Corpus ellipticum, ronvexum, densissime et suhtilissime punctatuni. 

 Caput mediocre; lobi laterales conligui, extus rotundati; spinas dua; 

 lalerales ante oculos. Rdslrum coxas posticas altingens. Antenna; ((iiadri- 

 articnlatie; articuii 2as et 3us dilalati ; 3us 2o valde brevior; lus fnsi- 

 I'onnis, {jjracilis, 3o brevior. Thorax inermis ; latera rotundata ; mar};o 

 posticus subrolundatus. Scutellum abdominis dimidio brevius, apice 

 rolundatum. Abdomen apice intej^rum. Pedes robusti ; tarsi biarticulati. 

 Alai anticie abdominis a|)icem altin}i;enles; menibrana venis quinque 

 longitudinalibus venulisque paucis transvcrsis. 



Body elliptical, convex, very thickly and minutely punctured. Head 

 not longer than its breadth; lateral lobes contiguous beyond tlie middle 

 lobe, rounded on the outer side and at the tips ; a porreet spine on each 

 side in front of the eyes. Eyes not prominent. Rostrum extending to 

 the hind coxse. Anleuntc four-jointed, second and third joints diJaled ; 

 third much shorter than the second ; fourth fusiform, slender, shorter than 

 the third. Thorax unarmed; sides rounded; hind angles not ])romiiient; 

 hind border slightly rounded. Scutellum less than half the length of the 

 abdomen, much rounded at the tip. Abdomen with the upper ajtical 

 membrane entire; two broad rounded laminie beneath. Legs stout; tarsi 

 two-jointed ; second joint much longer than the fust. Fore wings extending 

 to ihe lip of the abdomen ; membrane with five longitudiual veins and 

 with a few transverse veins. 



The very different structure of the thorax and the less reticulated 

 membrane of the fore wings distinguishes this genus from Megyjixenum. 



1. TUALMA BIGUTTATA. 



Purpureo-iiigra, sublus sordide ochracea ; aiilcniue nigrce, arliculo Ao 

 liiteo basi nigra ,■ ihoracix lalcra subviridia ; scutellum gullls duabus 

 luli'is, \o ba^ali, 2o apicali ; abd(»ninis liitera dorsalia luleo macn- 

 lala ; alee anliac nigricaules, corio sublus sordide leslaceo ; alie pos- 

 liccc purpureo-cyanecc. 



Purplish black, dingy ochraceous beneath. Antenna; black; fourth 

 joint luteous, black at the base. Thorax with a metallic-green tinge on 

 each side. Scuiellum with a luteous dot at the base and another at the 

 tip. Pectus and under side ol abdomen black-punctured, the former with 

 three irregular black stripes, of which there are some traces on the latter. 

 Abdomen above with luteous spots along each siilo. I-cgs black. Fore 

 wings blackish ; coiiiun lieneath dingy testaceous. Hind wings purplish 

 blue. Length of the body 8 linc>. 



a. .\mbuina. Picscntcd bv \V. W. Saunders, Esq. 



