Mr. J. O. Westwood on several ?iew British Insects. 443 



This property which the bicarbonate of potassa possesses 

 of decomposing the phosphates, is only available in qualitative 

 examinations; as the conversion into carbonate is only partial. 

 The use of the salts of lead in freeing the earths from phos- 

 phoric acid requires much time and attention ; whereas the 

 process here recommended, occupies but a few minutes, and 

 though not so complete in its effects, answers completely to 

 distinguish the earths when combined with the phosphoric 

 acid. G. O. Rees. 



LXXIII. Descriptions of several new BritishForms amongst the 

 Parasitic Hymenopterous Insects* By J. O. Westwood* 

 F.L.S. Sfc* 



[Concluded from vol. i. p. 129.] 



WM 



rrva % 



17. Monodontomerus, Westw. Torymusf B. a. Dalm. 



Torymus? Walk. 



f^ALLIMOMI Spin, affinis. Differt praecipue collari majori transverso 

 (fig. 2.) femoribusque posticis crassioribus, nee serratis, subtus dente 

 unico paullo ante apicem armatis (fig. 1.). Clava antennarum quam articulis 

 duobus praecedentibus vix brevior. Ramus stigmaticalis ut in Callimome. 

 Mesoscutum suturis distinctis. — Monod. obscurus, Westw. Viridi-aeneus, ab- 

 domine supra chalybeo cupreoque nitenti, subtus saturate fulvescenti, seg- 

 mento basali viridi ; femoribus piceis, in medio aeneis, tarsis tibiisque fulvis, 

 his in medio obscurioribus ; alas sub stigmate obscuriores stigmate fusco. 

 Antennae nigra?, scapo piceo-fulvescenti, oviductus abdominis longitudine. 

 Long. Corp. H lin« Variat paullo major, colore fulvescenti subtus magis 

 diffuse Ensham, August 1826. Warwick, August 1827- 



18. Mesopolobus 9 Westw. 



Tachylarthro Westw. affinis. Caput thorace latius, antennae sensim clavatae 

 13-articulatae, articulo 3tio annuliformi, 4to majori. Mandibular 3— 4-den- 

 tatae. Palpi maxillares furcati (fig. 4.). Tibiae intermediae fere ad apicem ex- 

 ternum lobo parvo triangulari ciliato. Thorax elongato-ovatus. Abdomen 

 parvum angustum depressum. ? ignota. — Mcs.fasciiventris, Westw. Laete 

 viridis, abdomen nigrum, chalybeo cupreo viridique nitens, fascia fulva ante 

 medium ; antennis fulvis, pedibus flavis, tarsis apice fuscis, tibiarum lobo 



* Communicated by the Author, 

 f Obs. Nomen "Torvmus" omnino respuendum. 

 3 L 2 



