 N. ensifer is a medium @-@ sized species , measuring 5 @.@ 5 to 10 millimetres ( 0 @.@ 2 to 0 @.@ 4 in ) . Excluding the mandibles , the head is 1 @.@ 93 – 2 @.@ 53 millimetres ( 0 @.@ 076 – 0 @.@ 100 in ) long and 1 @.@ 25 – 1 @.@ 69 millimetres ( 0 @.@ 049 – 0 @.@ 067 in ) wide . The scapes of the antennae surpass the occipital margin , and the second segment of the funiculus is longer than the first . The third and fourth segments are the same length as each other , although they are longer than the second . Between the fifth and second last segments , they are much shorter except for the last one . The head is twice as long than broad , and it is widest behind the eyes . The larvae measure 8 millimetres ( 0 @.@ 3 in ) in length and appear similar to that of N. albisetosus . The larvae can be distinguished by the abundance of hair with long stouts found on the body . The apical teeth of the mandibles are long and straight , whereas the medial teeth are much smaller . 
