122 Gtiide to Myriopoda. 



Table-case have been distinguished by differences in colour. Tlie tropical 



No. 27. forms (SpJiaerotlterium, Zophronia, etc.), occurring in Soutli Africa, 



Madagascar and South East Asia, are ofteii of large size. 



Order 2. Limacomorpha. 



In the Limacomorpha the l)ody tapers anteriorly and posteriorly 

 and the segments number from nineteen to twenty, the dorsal 

 plate of the last of them being of small size. The copulatory feet 

 are situated on the penultimate segment. The tracheae are 

 branched, and there are no stink-glands. 



The small slug-like millipedes belonging to this sub-order occur 

 in Java, Sumatra., and South America. As yet only three or four 

 species are known ; they form a single family, Glomeridesmidac, 

 with two genera, GlovwridcsmuH and ZciihroniodeHnuis. 



Order 3.— Helminthomorpha. 



The form of the l:)ody varies greatly in the Helminthomorpha, 

 and the number of segments varies from nineteen to over a 

 lumdred in the different forms. The auxiliary copulatory organs 

 of the male are situated on the seventh, on the seventh and eighth, 

 or on the sixth, seventh and eighth segments. The tracheal tubes 

 are not liranched, but tufted. There are five sub-orders. 



SuH-ORDKE 1.— LYSIOPETALOIDEA. 



The body of these millipedes is slender and sub-cylindrical, 

 and the number of segments is large and variable. They have a wide 

 distriljution. 



SuH-OKDER 1 1.— COLOBOGNATHA. 



The Colobognatha differ from the other sub-orders of Helmin- 

 thomorpha in that the mandibles and gnathochilarium are simplified, 

 the mouth -parts being more or less of a suctorial type. The 

 segments are numerous, and stink-glands are present. They are 

 found in the tropical or warmer temperate countries of the globe. 

 There are two families : Phitydcsinidae {Pldiijdcsmus, etc.), and 

 SijilionDidtondae [Siphonophora, Fohjzonitim, etc.). 



Sub-order III.— CHOEDEUMOIDEA. 



In the Chordeumoidea there are always either thirty or thirty- 

 two body-segments, bearing symmetrically placed bristles. Stink- 

 glands are absent. Tlie Chordeumoidea are chiefly European and 

 North American forms. The sub-order is represented in this 

 country by two species, the better known being Atractosoma 

 poli/desiiwideH. 



