HYMENOPTERA. 135 



Crernatogaster, Lund, Ann. Sc. Nat. xxvii. (1831). 

 Acrocoelia, Mayr. Ein. neue Ameis. 143 (1852). 



Maxillary palpi 5-jointed, labial palpi 3-jointed. Antennae 

 1 1 -jointed, the club 3-jointed. Anterior wings with one marginal 

 cell, incomplete ; one complete submarginal, and one discoidal 

 cell. Abdomen cordate, the petiole attached to the upper sur- 

 face of its base. 



The insects belonging to this genus of Ants construct their 

 nests on the branches of trees, suspending them in the same way 

 as Wasps, to the nests of which they have a close resemblance ; 

 on removing the outer covering, however, they exhibit a very 

 different construction, being composed of multitudinous, curved, 

 intricate ramifications, all leading to the interior chambers and 

 galleries. From the close resemblance which the nests have to 

 a wig, they have probably acquired the popular name of the 

 Negro-head, by which they are generally known in the Brazils. 

 The insects are readily known in consequence of the abdomen 

 being usually heart-shaped, and the peduncle by which it is at- 

 tached to the thorax being inserted at the top of the basal seg- 

 ment, instead of beneath, as it is in all the other genera of Ants. 

 These insects are described by observers as having a remarkable 

 appearance w r hen running about, as at such times they curve the 

 abdomen upwards, so that it partly overhangs the thorax behind. 



1. CREMATOGASTER SCUTELLARIS. PI. IX. fig. 7. B.M. 



Formica scutellaris, Oliv. Encycl. Meth. vi. 497. 32. 



Latr. Hist. Nat. Fourm. 261. 

 Myrmica Rediana, Duf. Rech. Anat. Hym. Mem. Ac. Sc. vii. 477- 



Gene, Mem. Sac. Ital. Sc. Pt.fis. xxiii. 



Myrmica Algirica, Lucas, Expl. Sc. de I'Alger. iii. 300. pi. 16. f. 9. 

 Myrmica rubriceps, Nyl. Addit. Alt. Adno. Mon. Form. Bor. 



*Eur. 44. 

 Acroccelia rubriceps, Mayr. Ein. neue Ameis. in Verhandl. des 



zool.-bot. Vereines in Wien, Band ii. 1852. 

 Acrocoelia Schmidti, Mayr. Ein. neue Ameis. in Verhandl. des 



zool.-bot. Vereines in Wien, Band ii. 1852. 

 Crematogaster scutellaris, Mayr'. Form. Austr. 197. 1. 

 Myrmica 'scutellaris, Nyl. Form. Fr. et d'Alger. 100. 28. 



Hob. Europe; France; Austria; Switzerland; Tuscany; Sar- 

 dinia ; Hungary ; Dalmatia. 



2. CREMATOGASTER SORDIDULUS. PI. IX. figs. 4 6. B.M. 



Myrmica sordidula, Nyl. Addit. Alt. Mon. Form. Bor. Eur. 44 ; 

 Form. Fr. et d'Alger. 101. 



