48 ASCAROIDEA 



fusiform swellings. Intestine a fat-body, without functional 

 anus. The mature forms retain the stylet-like organ and the 

 same structure of the alimentary canal. The head is rounded, 

 the tail conical. The male has two very short and slender 

 spicules and a very small accessory piece. Male genital tube 

 single, short and reflexed. Vulva towards the posterior end 

 of the body. Female genital tubes paired, opposed, but only 

 the anterior branch of the uterus weU developed and having 

 a reflexed ovary ; the posterior branch a small blind appendage. 



Hab. Parasitic stages in body-cavity of Insects. Free- 

 living stages in soil, etc. 



Genotype : S. bombi Dufour, 1837. 



Dufour, 1837, Ann. Sci. Nat., Paris, Zool., (2) vii, 9; 

 Leuckart, 1886, Zool. Anz., ix, 743; 1887, Abh. Math.-Phys. 

 CI. k. Sachs. Ges. Wiss., Leipzig, xiii, 614, 678. 



Atractonema gibbosum, the genotype of Atractonema, does not 

 appear to possess characters sufficiently distinctive to separate 

 it generically from Sphaemlaria. 



Subfam. 2. CYLINDROLAIMINAE Micoletzky, 1922. 



Buccal cavity elongate, t3rpically cylindrical, without teeth. 

 Lateral organs and caudal glands generally present. Excretory 

 system usually in the form of a ventral unicellular gland. 



1. Cylindrolaimus de Man, 1880. 



Cuticle finely striated, without lateral alae or bristles. 

 Head not distinct, without lips or papiUae, but with bristles. 

 Buccal capsule an elongate, cylindrical, or probably prismatic 

 tube. Oesophagus cylindrical, very little eiilarged posteriorly. 

 Lateral organs circular, situated anteriorly. Tail of male 

 elongate, sometimes with terminal spike, with one or more 

 median preanal papillae. Spicules slender, without midrib. 

 No accessory piece. Tail gland opens at the tip of the tail. 

 Vulva in middle region or posterior part of body. Female 

 genital tubes paired or unpaired. 



Hab. In moist soil, sand or fresh water. 

 Genotype : C. com.mu7iis de Man, 1880. 



de Man, 1880, Tijdschr. Nederl. dierk. Vereen., Leiden, 34; 

 1884, Die frei . . . lebenden Nematoden der Niederl. Fauna, 

 82 ; Micoletzky, 1922, Arch. f. Naturg., Abt. A, Ixxxvii, 204. 



2. Siphonolaimus de Man, 1893. 



Syn. Anthraco7iema zur Strassen, 1904. 



Cuticle finely striated, with bristles. Head without lips, 

 but with bristles. Mouth surrounded by six (?) small bristle- 



