OF THE UNITED STATES. 373 



Thalpius is very closely allied to Diapliorus, and forms the transition from this to the 

 next group: the anterior tihire, though thicker than in Galerita, are not compressed and 

 dilated as in Helluomorpha; the terminal spurs are ohsoletc. The first joint of the antenna 

 is as long as the three following; the succeeding joints arc equal in size, and vary in form 

 in the different species: in the type T. pygmauis, they arc almost square, with rounded 

 angles, so that the antennae become moniliform. The palpi arc as in Diaphorns, the max- 

 illary dilated, the labial small and filiform: the mentum tooth is broad ami indistinct: the 

 first joint of the posterior tarsi is as long as the three following. The body is elongated, 

 and the sides of the elytra are parallel. 



The genus Enaphorus Lee. (Ann. Lye. 5, 173,) founded on a Californian species EL ru- 

 fulus, must be suppressed, as it differs from Thalpius only in the form of the antennas, 

 which are more filiform, and less compressed. 



The type of Thalpius isT. p \ g m se us Lee. (Ann. Lye. .">, 17it.) which is Helluo pygm&us 

 Dej. (Sp. Gen. '2, 1G0.) A nearly allied species was given me by Mr. Guex, as coming 

 from Louisiana, which may be Diapliorus dorsalis Bruilt,SiB from my friend Dr.Schaum, 

 I learn that that species is very closely allied to the one just mentioned. The three species 

 may be thus defined: — 



1" T- Pyg m;1cus > elongatus, valde punctatus, fuscus, pubescens, elytris convexrasonlia, eribral 



striatis, interstitiis uniseriatim punctatis, basi late obsolete rufa; pedibus palpis antcniiisijuu tluvis, bis 

 brevioribus articulis fere rotundatis. Long. - 2. 



2. T. dors al is, elongatus, rufo-testaceus, valJe punctatus, pubescens, elytris planiusculis, cril.rato- 

 striatis, interstitiis uniseriatim punctatis, macula common] poetica infoscata, pedibus pallidi 



nis capite tboracequc longioribus, articulis oblongis. Long. "2. 



3. T. rufulus, depressus, rufo-testaceus, valdo punctatus, pubescens, elytris plants, rabtQins stri- 

 atis, interstitiis confuse punctatis, antennis capite tboracequc longioribus, articulis oblongis. Yariat 

 sutura postice infuscata. Long. -'2-. 



b. Ihlluow S. 



This group differs from the preceding, principally bj the broader anterior tibia?, and 

 shorter first joint of antenna': the elytra arc shorter than the abdomen, bul broadlj 

 rounded at the extremity. The affinity between tln< group and the Anthisa has been al- 

 ready observed by Chaudoir. (Bull. Mosc. 1850.) 



The only genus found in the United States is Helluomorpha Lap., with the lal-mm 

 large, concealing the mandibles, and the antennas Btrongly compressed and thickened 

 externally. The four described species are rery uniform in appearance, and apart from 

 size and colour may be best distinguished by the proportions of the joints ol the antenna-. 

 The anterior tarsi of the males are scarcely dilated. The two following species are m w. 



1. II. ferruginca, deprcssa, obscure ferruginca, capite thorooeqae (aide panotitis, hoa lateribaa 

 antico rotundatis, po3tice rabainuatis, basi perparam angn ognlifl posticu obi jrtru tho- 



race latioribus, sulcis minus profondia confuse punctatis, interstitiis vix parcc panel »nis 



capite tboracequc longioribus, articolo 1" vix dilatato, seqnentiboj qod tronsversis. '■ Dg 



