INJURIOUS MULLIPEDES. II9 



Polydesmus monilaris C. L. Koch — P. serratus, Wood. 



Description : Deep brown. Antennae pubescent, club-shaped ; 

 the dorsal plates of the segments armed with two rows of scales 

 and a broad anterior obsolete series, their lateral margins toothed. 

 Length one-third to one-half inch. The male genitalia hairy with 

 a double terminal spine. See Fig. i. Head and terminal seg- 

 ment, Fig. 5. 



Remarks : This was originally described from Pennsylvania 

 specimens and is a native species. In Maine it is the most com- 

 mon form found in cellars and under boards and rubbish every- 

 where out of doors. It is abundant in the greenhouses of Orono 

 in the radish beds, and is one of the culprits, having been caught 

 several times with its mouth in contact with the tubercles found 

 on radishes. 



lulus hortensis, Wood. 



Description : Brown, ornamented with a row of black spots 

 on the side; antennae rather short; hairy, slender, club-shaped; 

 segments of the body 42 ; scuta closely channeled, both above 

 and below ; spine at the end of the body wanting ; plate in front 

 of the anus triangular, with its apex rounded. Length, i inch. 

 The head and terminal segments are shown enlarged five times 

 in Fig. 2. 



Remarks : The young and the adults which have just molted 

 are lighter colored and show the spots on the sides plainly. The 

 spots do not show well on fully colored specimens. 



This species is abundant throughout the greenhouses at Orono, 

 and particularly so in the radish beds. It has also been caught 

 biting the radishes, causing excrescences. 



Lulus virgatus, Wood. 



Description : Deep brown ; back yellowish ; median dorsal 

 line black ; antennae moderately large, pilose, club-shaped ; seg- 

 ments 30-35. Dorsal plates distinctly grooved. Spine at the 

 end of the body wanting, anal scale sparsely hairy ; preanal 

 scale, broad, subtriangular with a rounded apex. Length from 

 1/2 io y^ inch. 



Remarks : The sides of the body of well colored specimens 

 are deep brown or almost black. The dorsum approaches a fawn 

 yellow and the median dark line is pronounced. Our specimens 

 do not show the lateral bands mentioned by Wood and Bollman 



